Introduction to SaaS APIs and Endpoints

All of the numerous software applications that are implemented for usage inside a company must operate effectively with current software. It's poor business to have one department use software that the other departments don't use or that won't operate with the other departments' software. This leads to a lot of misunderstandings among various departments or team members, or even among very small teams of 2-3 people in the eCommerce industry.
SaaS APIs are intended to address this issue by allowing developers to construct software packages that maintain internal channels of communication open. SaaS APIs make it easier to manage data, automate marketing campaigns, and more using solutions like Syncwith.
SaaS APIs can be quite useful for those who use Syncwith. In this guide, we’ll break down examples of what you can do with SaaS APIs, examples of popular SaaS platforms with APIs, the most popular endpoints for a variety of popular SaaS APIs, and everything else you need to know about using SaaS APIs. Let’s start with some examples of what SaaS APIs can be useful for.

Introduction to SaaS APIs

Some Examples of What You Can Do with SaaS APIs

There are quite a few things you can do with SaaS APIs.
  • To tie diverse programs into your user experience, leverage APIs and microservices. You may incorporate functionality from a range of third parties instead of trying to give all conceivable functionality in a single interface.
  • Update all of your Google Adwords campaigns at once.
  • Take a look at your Shopify orders.
  • Create a dashboard for leads using Salesforce and Pardot data.
  • Simplify the process of digital transformation.
  • Allow headless solutions for mobile apps, corporate apps, app marketplaces, and other applications.
  • By offering existing information to customers across a range of media, you may enable omnichannel marketing.
  • By connecting third companies via API, you may improve total data visibility.
  • Make it easy to spot flaws in a single module without affecting the overall performance of a bigger program.
  • Assist consumers in using their KPI dashboard to track data.
  • Reduce the number of people that leave your company.
  • Allow for the possibility of whitelabeling.
  • Using APIs and microservices to improve user experience allows you to create more tailored experiences for your consumers.
  • Increase the number of enterprise clients you have.

10 Examples of Popular SaaS Platforms with APIs

1. Salesforce  - Using a simple, powerful, and secure application programming interface, the Salesforce API gives programmatic access to organization information. It's the most popular SaaS platform for sales, marketing, and customer service. The Salesforce API is available for free.
2. Zendesk  - Developers may use this API to include chat, help center, speak, and sale functionality in their apps. A paid account is required to use this API.
3. Rentman  - Rentman API is a cutting-edge rental management system for live event rentals and productions. This API allows you to manage and arrange resources, scheduling, and communication from a single platform. This API is completely free to use.
4. Pipedrive  - Pipedrive provides an API for small businesses. Pipedrive's user interface visualizes client data to assist organizations in making better decisions. This API is completely free to use.
5. Trello  - Using task assignments, email notifications, visual kanban boards, and activity logs, this API allows users to discuss projects and tasks in real-time and keeps team members up to date. Trello is a service that requires a membership.
6. Mailchimp  - Users may sync email activity and campaign information with their database, manage lists, and observe and control Automation processes via the MailChimp API. This is a subscription-based API service.
7. Harvest App  - Harvest is a popular SaaS API that not only assists with time tracking but also with other business needs such as expenditure management, invoicing, and forecasting. Free and trial accounts are available for this API.
8. Slack  - Users may send messages, join or quit channels, track mentions, create files, and more using the Slack API. This API is accessible in both free and premium versions.
9. Shopify  - The Shopify API enables developers to design solutions that allow third-party apps to be easily integrated with Shopify. This API is completely free to use.
10. Twilio  - Developers may use Twillio to add capabilities such as shortcodes, smart content management, and text message delivery intelligence, among others. There is a fee for using this API service for inbound or outgoing SMS.

What is a REST API?

An application programming interface (API) is a collection of definitions and protocols for creating and integrating software applications. It's frequently described to as a contract between an information supplier and an information user, outlining the content that the consumer (the call) must offer and the material that the producer must provide (the response). An API may be thought of as a middleman between users or customers and the resources or online services they seek.
When designing web services, REST (Representational State Transfer) API is an architectural approach that adheres to a set of criteria. It was created as a replacement for SOAP APIs. Web Service APIs that meet the REST specifications are known as RESTful APs. A REST API, unlike SOAP, is not limited to an XML format and can return a variety of data forms depending on the situation. JSON, XML, and YAML are among the data formats accepted by the REST API.
When a client uses REST APIs, the server sends the resources to the client in a defined format. They function by delivering information about the requested source, which is then translated into an understandable manner. REST APIs allow for changes and additions from the client to the server, which has some similarities to GraphQL Mutations.
An API must follow certain architectural limitations, or principles, in order to be considered a REST API. The interface is segregated from the backend and data storage in a client-server architecture. This provides for flexibility and the evolution of separate components independently of one another.
Another property of REST APIs is their statelessness. Between requests, the server does not save the client context. Clients can cache replies, hence a REST API response must clearly declare whether or not it can be cached. REST APIs must be a tiered architecture as well. Whether talking directly with a server or through an intermediate such as a load balancer, the API will operate.
Despite the fact that the REST API must fulfill these standards, it is seen to be more user-friendly than a prescribed protocol such as SOAP, which has particular requirements such as XML communications and built-in security and transaction compliance, making it slower and heavier. REST is a collection of standards that can be used as needed, making REST APIs faster and lighter while also enhancing scalability— perfect for IoT and mobile app development.

Other Types of APIs and Their Differences to REST APIs

  • GraphQL - GraphQL is a runtime for satisfying queries with existing data, as well as an open-source data query and manipulation language for APIs. GraphQL, which is mostly managed and developed by the GraphQL Foundation, has a wide range of verticals and use cases with many companies embracing it. The fundamental difference between GraphQL and REST APIs is that GraphQL is a query language standard, whereas REST is a network-based computing architectural approach. Note that this article mostly focuses on server-side concerns. As an alternative for REST APIs, GraphQL is gaining traction.
  • SOAP API** - A well-known web API protocol is SOAP (simple object access protocol). It's designed to be flexible, agnostic (able to work with a variety of communication protocols, including HTTP, SMTP, TCP, and others), and self-contained (it allows for any programming style) There are a few distinct models in the SOAP specification. How to process a SOAP message is covered by the processing model. SOAP features and modules are used in the extensibility model. How to utilize SOAP with an underlying protocol, such as HTTP, is covered by the protocol binding rules. How to structure a SOAP message is covered in the message construct. Although the two are commonly regarded as rival standards, it is feasible to construct a RESTful API while using SOAP protocols.
  • JSON-RPC and XML-RPC- An RPC is a protocol for making a remote procedure call. XML-RPC calls are encoded using XML, whereas JSON-RPC calls are encoded with JSON. Both protocols are straightforward. A call can have numerous arguments, but only one result is expected. They have a few essential characteristics that necessitate a different design than REST. They're made for calling methods, whereas REST protocols are for transferring content (resource representations). REST is concerned with resources, whereas RPC is concerned with actions. The URI identifies the server but has no information in its arguments, whereas the URI in REST contains information like query parameters.

Types of HTTP Methods with a RESTful API

There are a number of different HTTP methods that utilize RESTful API. These include the following:


POST is the sole HTTP method in the RESTful API that primarily works with resource collections. Applying POST to the parent resource instructs it to build a new resource, associate it with the correct hierarchy, and provide a dedicated URL for subsequent usage when constructing a subordinate resource in a collection. Keep in mind that POST is not idempotent, which means you can't use it more than once and expect the same consequence or result. One of the most important features of POST is that it allows developers to describe resources directly. This feature prevents teams from inadvertently generating subordinate resources, which can pollute code, muddle references, and cause difficulties in apps.


The most used HTTP method is GET, which returns a representational view of the contents and data of a resource. The read-only mode of GET should be utilized to keep the data secure and the resource idempotent. Unless another client modifies it in the meanwhile, you should receive the same results no matter how many times you use this technique. The GET method is occasionally used to modify the contents of a resource, although this is a risky application of the technique. It's usual for a client's ability to PATCH a resource to be jeopardized if the resource detects a change since the PATCH client's last GET.


PUT is the single-resource equivalent of POST, as it modifies a resource by completely replacing its content. PUT is the most typical RESTful API HTTP method for updating resource information. It is possible to generate a resource via the PUT technique, however as previously stated, this approach entails the danger of accidentally generating resources. When PUT is applied to a group of resources, the entire collection is replaced, which is rarely the case.


DELETE is the last HTTP method to look at. When a DELETE method is used to delete a single resource, the resource is completely gone. DELETE implementations are frequently inconsistent: the resource's URL may remain accessible even though the resource itself is no longer available. In this case, it's feasible that the server or resource implementation will still use the URL to modify the status of the disappeared resource, and that subsequent DELETE executions would be handled differently. While it's feasible, you should normally avoid using the DELETE method in a resource collection since it deletes everything in it. It's important to remember that the technique isn't idempotent and shouldn't be viewed as such.

Top 6 SaaS APIs

Zendesk API

note to writer: i just googled about zendesk to build the description of the company and their service
Zendesk is service focused CRM designed to allow companies to easily interact over text, mobile, phone, email, live chat and social media. It’s primarily used by customer service agents to support customers cross channel and mange tickets.

Quick Tips on the ZenDesk API

  • Zendesk utilizes REST apis
  • Accepts encoded request bodies
  • Returns responses in JSON (aka JavaScript Object Notation)
  • Utilizes standard HTTP response codes and authentication
  • You can create (POST), retrieve (GET), update(PUT) and delete (DELETE) Zendesk objects
  • Zendesk endpoint URLs will have a server / subdomain that is specific to your account - you set this up when you create an account with Zendesk. So you’ll need to included your specific subdomain in the endpoint URL.
    • Eg to get your agent info you use https://{subdomain}
    • So if you work at Acme and created the subdomain acme when you created your account the endpoint you would use is Eg to get your agnent info you use

Popular Zendesk API Endpoints

The Zendesk API has 31 endpoints the 4 most popular endpoints are


  • The full endpoint used is https://{server}
  • This endpoint returns all your active Zendesk tickets (archived tickets are excluded)
  • The API uses OAuth and applies access permissions such that only tickets the user has access to are returned
  • server - refers to your accounts specific subdomain
  • Access the official API docs in order to reference what is specifically possible, limitations, how to paginate, etc.
Sample Response:
Status 200 OK { "tickets": [ { "assignee_id": 235323, "collaborator_ids": [ 35334, 234 ], "created_at": "2009-07-20T22:55:29Z", "custom_fields": [ { "id": 27642, "value": "745" }, { "id": 27648, "value": "yes" } ], "description": "The fire is very colorful.", "due_at": null, "external_id": "ahg35h3jh", "follower_ids": [ 35334, 234 ], "group_id": 98738, "has_incidents": false, "id": 35436, "organization_id": 509974, "priority": "high", "problem_id": 9873764, "raw_subject": "{{dc.printer_on_fire}}", "recipient": "", "requester_id": 20978392, "satisfaction_rating": { "comment": "Great support!", "id": 1234, "score": "good" }, "sharing_agreement_ids": [ 84432 ], "status": "open", "subject": "Help, my printer is on fire!", "submitter_id": 76872, "tags": [ "enterprise", "other_tag" ], "type": "incident", "updated_at": "2011-05-05T10:38:52Z", "url": "", "via": { "channel": "web" } } ] }


  • This API delivers a list of tickets along with stats for each of them.
  • Tickets are sorted by the date they were produced, from newest to oldest.
  • Due to ticket archiving, the latest ticket mentioned may not be the absolute oldest ticket in your account.
  • The answer does not contain any tickets that have been archived.
  • Cursor and Offset pagination are two types of pagination.
  • The maximum number of records per page is 100.
  • Returns a single measure or all of the metrics for a single ticket.


  • A URL parameter named [query] is used to express search queries.
  • The search string query syntax provides a lot of versatility.
  • Use [query=123456] for ticket IDs, [query=Johnathan] for any record containing the term Johnathan, [query=type:user "Johnathan James"] for user records that include the specific label "Johnathan James," and so on.
  • The equality operator is represented by the ":" letter. "" and ">," the negative sign, and the wildcard character "*" are among the other operators.
  • A search query is specified using double quotations, "". Exact word matches are used by the API.


  • You may use this API to get a list of Zendesk users.
  • Although cursor pagination is preferred, offset pagination is also an option.
  • The maximum number of records per page is 100.
  • Admins, Agents, and Light Agents are permitted to use this endpoint.
  • Using "external id," you may get a list of people based on their external id. Each user under the same account must have a unique external id.
  • For custom roles, use "permission set," which is accessible on the Enterprise plan and higher. Per request, you may only filter by one role ID.

Rentman API

Rentman is a one-stop shop for planning and managing your rental initiatives in the cloud. Rentman gives you more control over your equipment, transportation, and personnel scheduling. You and your team can do more in less time by collaborating in the software.
Rentman allows you to manage all of your rentals from a single platform on any device, onboard your whole staff and keep track of what's going on in your business, and save time planning projects, managing equipment, and scheduling your crew. With our visual tracking tools, Rentman can also help you manage your inventory and keep track of equipment availability.
Rentman is suitable for a wide range of applications. Rentman is a useful tool for planning equipment, staff, and transportation for large and small projects. This is also a good platform to explore if you simply require software for 1 to 100 users or if you deal with freelancers.

Quick Tips on the Rentman API

You already have access to several native external connectors if you have a Rentman account. You may use the Rentman public API to create your own integrations with other apps. An API token is required to utilize the Rentman API. Like a password, the API Token is customized and used for authentication. We highly advise that you retain a record of this token and keep it secure.
Here are a few quick tips on the Rentman API:
  • Try using this API to save files into offline storage.
  • Use this API to send out feedback forms.
  • Try connecting this API to your existing HR software.

Popular Rentman API Endpoints

The Rentman API has 92 endpoints the 4 most popular endpoints are appointmentcrew, appointments, contactpersons, and contacts. Rentman API’s base endpoint is [].


  • You may use this endpoint to find out which crew member is associated with a certain appointment.
  • You can also use this endpoint to create appointmentcrew linked items and get appointmentcrew linked collections.
  • [Array of objects] = All of the information about the items requested.
The number of items in the data ([itemCount#]).
  • [limit#] = The maximum number of elements in data that can be stored.
  • [offset#] = The number of elements in the data that were skipped.


  • You may read, write, edit, and remove appointments in Rentman using this endpoint.
  • Obtain an appointments collection, get an appointments item, update appointments items, and remove appointments things.


  • Within a Contact, this endpoint indicates a person or department.
  • A single Contact is always connected with a Person item.
  • This may be used to obtain information on a contactperson's collection, item, and so on.
  • This endpoint may also be used to edit a single item, remove a user's entry, or get files as a linked collection.


  • This endpoint represents a business or an individual.
  • This API may be used to create new contacts, retrieve contact collections, extract a contact or item listed under a contact, and edit or remove contacts.

Pipedrive API

Pipedrive is a deal-driven customer relationship management CRM solution that also functions as an account management tool and may help with marketing and the sales process. Pipedrive's proactive nature records and organizes calls and emails automatically, as well as synchronizes calendars across devices. Pipedrive's ability to see the sales process from beginning to end may be particularly appealing to most small to midsized enterprises (SMBs). This may boost productivity while also eliminating a lot of internal second-guessing, which is one of the most common reasons CRM projects fail. Basically, pipedrive is a CRM with a sales focus, making it an excellent solution for individuals in the eCommerce business.

### Quick Tips on the Pipedrive API

Pipedrive is a sales CRM with a RESTful API that is easy to use. You may use their API to build public or private apps with OAuth 2.0 and API token integrations. Public applications and integrations are accessible in the Pipedrive Marketplace and work directly with Pipedrive. The Pipedrive API has a number of endpoints that may be used to help you create an app for the Pipedrive Marketplace.
Here are a few quick tips on the Pipedrive API:
  • Remember that you will need to validate apps through the OAuth 2.0 flow.
  • Keep your API token in a safe place.

Popular Pipedrive API Endpoints

The Pipedrive API has 137 endpoints the 4 most popular endpoints are /v1/deals, /v1/organizations, /v1/users, and /v1/activities. Pipedrive API’s base endpoint is [https://{server}].


  • Deals are sales to an organization or a person that are ongoing, lost, or won.
  • Each transaction has a monetary value and must be assigned to one of many stages.
  • A user can own a deal, and one or more people can follow it.
  • This API retrieves all deals based on user ID, filter ID, stag ID, status, limit, sort, and other criteria.
Sample Response:


  • Companies and other types of organizations with whom you do business are referred to as organizations.
  • Organizations can be related with people, and each organization can have one or more people.
  • All organizations are returned by this endpoint.
  • User and filter IDs, as well as start, limit, and sort, are some of the options.
Sample Response:


  • People who have access to your Pipedrive account are known as users.
  • A user can be associated with one or more Pipedrive accounts, therefore removing a user from one account will not remove them from the data storage if they have numerous accounts.
  • This endpoint gives information about all corporate users.
  • Allows you to search for users by name, followers, and other criteria.
Sample Response:


  • Activities in a calendar are appointments, tasks, or events that can be linked to a deal, a lead, a person, or an organization.
  • Activities can be of many types and allocated to certain users.
  • This service gives a list of all actions associated with a certain user.
  • Filter ID, type, limit, start, start date, end date, done, and other parameters are available.
Sample Response:

Trello API

Trello is a free Kanban-based project and task management solution used by approximately 50 million people across the world to collaborate and stay organized. Trello may be used to organize tasks, projects, and more in almost any organization or sector. Trello allows you to track task and production processes from start to finish, manage schedules, keep track of project progress, manage your company's hiring and onboarding, connect calendar tools to manage your time, and manage scrum workflows within your software team.
Trello employs the well-known Kanban project management technique. Your process is divided down into columns on a task board in Kanban. Trello was created to be intuitive so that almost anybody, including those with low technical knowledge, can use it. As a result, it's an excellent choice for entrepreneurs or small company owners looking for a very simple learning curve.

Quick Tips on the Trello API

Trello includes a basic RESTful web API with which you can connect with each sort of resource, such as a card, a board, or a member. You'll need to receive your Application Key before you can access this API. Logging into Trello and going to the appKey generating page will give you your application key.
Here are a few quick tips on the Trello API:
  • Remember that this API can be used for notifications and tokens, not just checklists and boards.
  • Trello uses a delegated authentication flow for added security.
  • Try to keep the bulk of your focus on Boards, but be sure to branch out into different features to really get the most out of this API.

Popular Trello API Endpoints

The Trello API has 171 endpoints the 4 most popular endpoints are:
  • /1/boards/{boardId}
  • /boardStars, /1/actions/{id}
  • /1/checklists/{id}/{field}
  • /1/lists/{id}/moveAllCards.
  • Trello API’s base endpoint is


  • Users can get boardStars on a Board using this endpoint.
  • Application/json is the content type.
  • Make use of the GET command.
  • "Mine" and "none" are examples of valid values.


  • This endpoint allows users to get an action with the “Get” feature.
  • Should include the ID of the action.
  • Query parameters include display, entities, fields, members, etc.
Sample Response:


  • This endpoint makes it possible to get a field on a Checklist.
  • Path parameters include string ID and string field.


  • This endpoint allows users to move all of the cards in a particular list.
  • Path parameters include string ID.
  • Query parameters include idBoard, idList, etc.

Mailchimp API

Mailchimp is a marketing automation tool created for companies who use email to communicate with their target consumers. It's a one-stop shop for managing mailing lists, customizing email templates, and nurturing and automating your whole marketing campaign. Businesses who want to use email marketing should use a service like Mailchimp to operate their campaigns like a well-oiled machine.
Mailchimp is usually used to collect leads for your email database and then send them mass emails and social media messaging. It also offers website and eCommerce capabilities. You can also use Mailchimp to develop opt-in web forms to attract people to join your email list. Basic fields such as first and last name, email, phone number, and address may be captured, and custom fields can be created to collect information particular to your industry. You may also divide your mailing list into distinct groups.

Quick Tips on the Mailchimp API

The Mailchimp Marketing API allows developers to build unique features that sync email activity and campaign metrics with their database, manage audiences and campaigns, and more via programmatic access to Mailchimp data and capabilities. A Mailchimp account is required to access the Marketing API. What you can do with the API is determined on your Mailchimp plan level. You can acquire an API key and start performing API requests once you've created an account and logged in.
Here are a few quick tips on the Mailchimp API:
  • Remember that administrators can see and generate API keys for other users.
  • Disable your API keys if you believe your Mailchimp account has been compromised.
  • Use API Root to view all available resources in the API.

Popular Mailchimp API Endpoints

The Mailchimp API has 150 endpoints the 4 most popular endpoints are /3.0/reports, /3.0/lists/{list_id}/members, /3.0/campaigns, and /3.0/lists/{list_id}/growth-history. Mailchimp API’s base endpoint is [https://{server}].


  • [reports] refers to a variety of objects, each representing a specific report resource.
  • This endpoint uses the Get features to generate campaign reports.
  • Query parameters include fields, exclude_fields, count, offset, type, before_send_time, since_said_time, etc.


  • This allows users to list members’ information and get information about members in a very specific list in Mailchimp.
  • Path parameters include list_ID.
  • Query parameters include fields, count, offset, email_type, and more.


  • Campaigns are the means via which you deliver emails to your Mailchimp subscribers.
  • To manage campaigns in your Mailchimp account, use the Campaigns API methods.
  • This endpoint allows you to retrieve all of the campaigns in a given account.
  • Fields, count, offset, type, status, list ID, sort dir, and other parameters are among the query parameters.


  • The ability to read a summary of a list's month-by-month growth activities is referred to as growth history.
  • Users may get list growth history data and a month-by-month overview of a single list's growth activities using this endpoint.

Harvest App API

Harvest is a cloud-based time-tracking system for businesses of all sizes. The solution's timesheet and invoicing features are ideal for small businesses and freelancers. Important tasks include time and expense management, team management, project management, scheduling, and invoicing. Harvest makes it simple to input time on timesheets with just one click. A desktop widget, a mobile device, a Mac, and a PC are all examples of gadgets that may be used to track time. Users can approve timesheets, and the system will remind workers to submit their timesheets on a regular basis.
Harvest is a simple, lightweight time tracking app that's simple to learn and use on a daily basis. This solution makes it simple for your team to manage time using dedicated applications across devices, as well as set automatic reminders to keep them on target.

Quick Tips on the Harvest App API

All accounts, even free accounts, get API access as part of your Harvest subscription, which may be used to administer your Harvest account. The Harvest API is available to all Harvest accounts. Administrators will have full access to all API calls, Managers will have full access to the projects and individuals they supervise, and Members will only have access to their own Timesheet.
Here are a few quick tips on the Harvest App API:
  • We recommend using the V2 version instead of the legacy V1 documentation.
  • API requests include GET, POST, PATCH, and DELETE.
  • API responses are formatted in JSON and HTTP is used for response codes.

Popular Harvest App API Endpoints

The Harvest App API has 19 endpoints the 4 most popular endpoints are
  • /v2/reports/project_budget
  • /v2/reports/uninvoiced
  • /v2/reports/time/clients
  • /v2/contacts
  • Harvest App API’s base endpoint is


  • Users can view a project's budget report for a certain timeframe using this API.
  • An object having a "results" property in the response includes an array of up to "per page" results. Each element of the array represents a distinct result object.


  • The Uninvoiced Report allows administrators to see all projects.
  • Managers who have the ability to produce invoices can only see projects that they are responsible for.
  • Users can view all uninvoiced reports using this endpoint.


  • Where recorded time is present for a particular timeframe, time reports display the hours and billable information for each client, project, task, or user.
  • Each time a report is requested, the URL's query string must include both the "from" and "to" parameters.


  • A list of your contacts is returned by this endpoint.
  • The contacts are returned in the order in which they were generated, with the most recently formed contacts showing first.