What is API integration? And why is it important?

An overview on API integration

When data can’t move freely between your apps, harmful business consequences emerge. 

Employees will have to navigate between apps just to find the data they’re looking for; they’ll have to perform double data entry constantly; and they’ll have to give up valuable time in performing business-critical tasks. 

You can address these issues head on by investing in API (application programming interface) integration. How does it help? We’ll explain, but let’s start by aligning on what the term means.

What the next phase of automation looks like

Download whitepaper

What is API integration?

It’s the use of an in-house or 3rd-party solution to facilitate communication between applications via their APIs. Once connected, these applications can request and share data between one another seamlessly, effectively eliminating any data silo at your organization.

For example, say you use Salesforce as your CRM and Marketo as your marketing automation platform. Using an API-based integration, you can connect the systems and allow key information to flow between them. Has a sales rep updated a prospect’s status in Salesforce? Those edits can instantly be reflected in Marketo; did a prospect’s lead score change after a Marketo campaign? The corresponding Salesforce account can automatically use the new score—and so on. 

This API integration example is just the tip of the iceberg, as you can apply it to any combination of apps in your ecosystem.

Related: What is a REST API?

Why is API integration important?

Here are 7 key benefits of API integrations:

It offers high performance

There are a number of reasons why APIs are a great option for implementing integrations:

  • Can move data in milliseconds or seconds, allowing employees and partners to access data as soon as they need it
  • Provides a security layer with access controls, ensuring that only specific employees have access to certain data points
  • Unaffected by changes to your application’s UI, making them more resilient in the long run than RPA software
  • Purpose-built for integration, and as a result, APIs focus on providing a high level of performance and stability 

It saves employees time

Now that your employees can avoid moving between apps to find the data they need, they’ll save a significant amount of time that they can reallocate towards other, more important, tasks.

Your marketers can spend more time on creating content assets for a given campaign; your sales reps can focus more on building out presentations for key prospects; your colleagues in finance can ideate strategies for improving their compliance and risk management; your employees in HR can hold more important conversations with employees, etc.

Related: Why API management is important

It prevents human errors

No individual is immune to mistakes. If they’re tasked with updating several applications themselves, they’re bound to make errors that lead to big issues down the line. 

For instance, if someone working in Salesforce gives a prospect a higher lead score than what’s shown in Marketo (i.e. the source of truth), a sales rep can be misled into thinking that a prospect is more sales-ready than they really are. This can lead the rep to nurture that prospect in a way that comes off as aggressive—ultimately dissuading the prospect from engaging with your brand any further.

API integration lessens the number of manual tasks your employees perform, thereby lowering the chances of incidents like the one above from taking place.

It improves the employee and customer experience

With employees able to spend more of their time on tactical, thoughtful tasks, versus manual, repetitive ones, they’re more likely to enjoy their work and be more productive. This also benefits customers as, according to the Harvard Business Review, happier employees are more likely to deliver experiences that leave customers happier as well. 

Related: How SaaS integration can deliver value to your organization

It helps you get the most out of your apps

Once your apps include additional data via API integrations, the utility they provide to users only amplifies. Here are just a few examples:

  • You CRM platform can provide a 360-degree view on prospects and clients, empowering sales reps and colleagues in customer-facing roles to manage these key relationships more intelligently
  • Your applicant tracking system can retrieve offer letters sent to candidates and their respective completion statuses, helping recruiters track target candidates and follow up when necessary
  • Your ERP system can display accurate order information and generate invoices instantly, helping your finance team manage vendors effectively
  • Your marketing automation tool can access clients’ product usage data, enabling your marketers to nurture upsell and cross-sell opportunities successfully

It strengthens your relationships with partners

You might partner with 3rd-party organizations to help sell your product or support clients. In either case, API integrations can help strengthen the partnership.

For example, let’s say that you rely on partners to advise and support clients. Let’s also assume that your middleware tool can provide API management capabilities (which isn’t always the case). In this scenario, you can provide APIs that share new clients and provide details around the sale (e.g. the plan they purchased). Your partners can then connect these endpoints with their own internal system(s), allowing them to quickly become aware of the clients they need to reach out to and how they need to support them.

It can enhance the product your organization offers

Many popular apps rely on API integrations to deliver value for end-users. You can point to various real-world examples for proof. 

This can be anything from a travel site like Expedia, which uses the APIs of various 3rd-party sites to help its searchers find the best deals on flights, hotel stays, car rentals, etc. to a payment service like Venmo—which uses the APIs of several banking institutions to let users transfer money over to their accounts.

Though your product’s API use cases may not be as obvious as the examples above, you’ll likely identify several opportunities that can improve your end users’ experience.

Related: What is an iPaaS? 

How to build an API integration

Once you’ve decided to integrate your apps via their APIs, the next question is how you want to go about doing it. You have a few integration solutions to choose from, with each offering a unique set of pros and cons:

1. Native API integration: When you use an app’s pre-built integration with another app.


  • Often provided at a low cost with your subscription
  • Normally supported by the organization that provides them
  • Can cover a variety of use cases across popular apps


  • Your organization likely has specific integration requirements that aren’t met by the native integration
  • The organization’s engineers have competing priorities, which can prevent them from focusing their time and effort on enhancing and fixing their native API integrations
  • It can’t deliver real digital transformation as building integrations doesn’t dramatically change your organization’s core workflows

2. In-house API integration: When your team builds the API integration from the ground up.


  • Can be customized to fit the needs of your organization
  • Certain API integrations may be less complex to build


  • Can come at an extremely high cost, as it takes your colleagues with a technical background a significant amount of time to develop and maintain each integration
  • It’s an unscalable solution, as you likely have hundreds of apps that you’d like to integrate
  • It can’t deliver real digital transformation as building integrations doesn’t dramatically change your organization’s core workflows

3. 3rd-party API integration: When you use a middleware platform to implement the integration.


  • Can help you integrate several apps quickly and securely
  • Normally provides support for existing connectors while adding new connectors over time
  • Users can access a single dashboard for monitoring the integrations


  • It requires technical skills, which prevents the team at large from building integrations
  • It can take a long time to get comfortable with the platform and to build integrations at scale
  • It can’t deliver real digital transformation as building integrations doesn’t dramatically change your organization’s core workflows

You’ve likely noticed a common thread across these options: They can’t transform the core operating processes at your organization. What can? Read on to find out.

Related: Everything you need to know about workflow integration

How Workato is different 

Workato, the leader in enterprise automation, allows your team to integrate SaaS apps, on-prem systems, databases, etc. AND build end-to-end automations across core processes without writing a single line of code. 

Want to learn how the low-code/no-code platform can enable your broader team to build integrations effectively and safely? Wondering how enterprise automation can transform your organization’s business processes?

You can uncover the answers to both questions—and more—by speaking with an automation expert.


API integration can invite a wide range of questions. In case any of yours haven’t already been answered, we’ll tackle some additional commonly-asked questions below.

What is an API management platform?

It’s a platform that allows you to create and host API endpoints. The endpoint can function in a variety of ways: it can call the API of another application, retrieve data from a database, download a file and look up information in that file, or perform specific business logic.

As you build up your collection of APIs, your colleagues and partners can begin to rely on them when implementing automations and do so without worrying about the applications and data behind the API endpoints. 

What other types of integration exist?

You can also integrate applications at the UI level with RPA software. More specifically, using the software, you can program a software bot to copy the activities a person takes in performing a specific task (e.g. keying in data). In addition, you can integrate applications via file sharing, where files that contain data from the systems are exported and imported to one another.

While the integration approaches above can be valuable when used in the right scenarios, they come with several drawbacks. As an example, data can’t move in, or near, real-time between applications (instead, data would move from one system to another in minutes, hours, or even days).

What is an API integration platform?

It’s a middleware tool that allows you to connect applications via their APIs. 

In the real world, middleware tools normally offer more than one means of connecting applications. For example, in addition to providing API-based integration, they would allow you to connect applications via file sharing. Therefore, an API integration platform, according to its narrow definition, rarely exists today.

About the author
Jon Gitlin Content Strategist @ Workato
Jon Gitlin is the Managing Editor of The Connector, where you can get the latest news on Workato and uncover tips and frameworks for implementing powerful integrations and automations. In his free time, he loves to run outside, watch soccer (er...football) matches, and explore local restaurants.