The Complete Guide To Payment Gateway APIs

September 27th, 2022 by Felix Cheruiyot


Payment gateway APIs are a core part of our everyday lives. You’ll find them on websites, apps, and even physical POS terminals. In most cases, they’re barely noticed until you need to make a purchase.

An API (application programming interface) is a set of instructions software developers can use to build services or applications. Payment gateway APIs provide developers with pre-built protocols to integrate payment services into their apps. The integration process helps businesses avoid building these services from scratch and streamlines the user experience for customers who want to purchase using their app.

Read on to learn how payment gateways work, why they’re important, and which ones you should use if you’re building an app that accepts payments.

What is a Payment Gateway API?

Application Programming Interface, API, is a set of instructions software developers use to build services and applications. Basically, an API enables computers and devices to talk with each other.

Payment gateways are the backbone of modern online commerce, and integrating one into your website or application is a must if you want to take your business to the next level.

Payment gateways allow you to accept payments from your customers, authorizing and processing them through a network of banks and processors. This streamlines the payment process for your customers and can also help reduce your processing time and costs. Additionally, a payment gateway API could also be used by other businesses, such as a subscription service that needs to bill customers regularly.

Using an API, you can create a custom interface allowing other businesses to access and use your payment processing capabilities without integrating them into your website or application. This would give them access to your customer base and reduce the work they must do to manage payments.

This could include a service that provides content, such as a magazine, an online service, or a blog. Integrating a payment gateway API into your website or application allows you to process and manage payments for your customers easily. The result is a streamlined payment process, reduced time to market, and costs associated with processing payments. A credible payment gateway provider securely stores payment information, especially when used for an eCommerce business.

How Do Payment Gateway APIs Work?

When you make a payment online, you typically use a payment gateway to process the transaction. A payment gateway is a specialized software application that allows businesses to accept payments electronically. e-Commerce merchants often use payment gateways to accept credit card and debit card payments from customers. But how do payment gateway APIs work?

In short, a payment gateway API is a set of programming instructions that allow the software to interact with a payment processing system. This enables businesses to develop custom applications to process payments without using a third-party service. There are two types of payment gateway APIs: RESTful and SOAP. RESTful APIs use standard HTTP methods (like GET, POST, PUT, and DELETE) to perform actions, while SOAP APIs use XML for requests and responses. Both APIs can be used to process payments, but RESTful APIs are typically easier to work with.

When you use a payment gateway API, you'll need to provide basic information about the transaction, such as the amount charged and the customer's billing information. The payment gateway will then communicate with the customer's bank to verify that the funds are available and process the transaction. Once the transaction is complete, the payment gateway will respond to your application, indicating whether or not the payment was successful. One of the benefits of using a payment gateway API is that it simplifies the payment process for both businesses and consumers.

Instead of entering their credit card information on different websites, consumers can use a single account to make all their online purchases. And because businesses can develop their custom applications for processing payments, they have more control over the user experience. They can offer a more seamless checkout process for their customers. Another benefit of using a payment gateway API is that it can help reduce fraud.

When businesses use third-party services to process payments, they typically have less visibility into what's happening behind the scenes. This can make it difficult to identify fraudulent activity and take action to prevent it. But businesses can implement fraud detection mechanisms tailored to their specific needs when developing payment processing applications. This helps them catch fraudsters before they cause any damage.

Payment gateway APIs offer many benefits for merchants and consumers and are an important part of the payments ecosystem. If you want to add online payment functionality to your application, consider using a payment gateway API instead of a self-hosted service. You'll enjoy increased control over your checkout process, reduced fraud risk, and improved customer data security. You get to save a lot from overheads associated with maintenance of the systems, compliance requirements costs, e.g., PCI-DSS Certifications, and so much more since you process credit card payments.

Why do you need a payment gateway?

Businesses often find themselves inundated with new requests and tasks as they grow. Payment gateway APIs automate this process by taking care of the heavy lifting for businesses, freeing up their time to focus on the important tasks at hand. Businesses can reduce the time it takes to process a payment by automating it, which can positively impact their bottom line.

These APIs can help businesses automate order fulfillment, customer management, and shipping. Payment gateway APIs can be used in conjunction with e-commerce platforms and other online tools and directly with banks and payment processors. Depending on the provider and product, payment gateway APIs can offer many features and capabilities.

Payment gateway APIs can help businesses automate certain tasks, such as processing payments and providing an enhanced user experience.

Easy checkout

Payment gateway APIs facilitate a swift and seamless checkout experience, giving your customers a great user experience whenever they’re on your platform. Your customers want to be able to purchase your product quickly and easily, and a payment gateway API can make that happen without wasting a lot of time on your checkout page. A payment gateway API integration can be done in a few simple steps, making your customers’ lives much easier. In addition, a payment gateway API will allow you to accept various payment types, including credit cards, debit cards, and mobile money.

Get improved customer experience

You’ll be amazed at how much better your customer experience will be if you integrate a quality payment API on your platform. One of the perks of payment APIs is that they can improve the customer experience in several ways. Customers love it when they can checkout in just a few clicks, and that’s exactly what payment APIs offer.

A quality payment gateway API enables customers to pay with their preferred method without friction. Plus, they’ll appreciate the transparency and security of using a payment API. This leads to a better customer experience and more repeat business for you.

With a payment gateway API, you can streamline and simplify the checkout process for your customers. This can help reduce abandoned carts and increase conversions. Not to mention, it can also help you save on processing fees. This leads to a better customer experience, which is always good.


If you’re a merchant using payment APIs, you can get creative and customize your store’s checkout experience. For example, you can add middleware to your payment processor that will allow you to run promotions and offer discounts. You can also use this checkout customization to upsell products to customers. And because these payment APIs are built on top of the existing infrastructure, you can be sure that your transactions will be secure.

That could mean anything from modifying the design to changing how your store communicates with the gateway, issuing refunds, and much more. The possibilities are endless. You can use APIs to automate tasks, like issuing refunds for canceled orders. This can be especially helpful if you use a marketplace platform like Shopify and want to streamline the process for your customers.

Many ways to transact

Payment APIs provided by IntaSend support a wide range of transaction types, so they’re not only limited to card payments. They also support M-Pesa, Bitcoin payments, and many more. This makes IntaSend the perfect choice for merchants wanting to expand their payment options and reach a wider audience. The flexibility of IntaSend’s APIs ensures that you can integrate them into any e-commerce platform, making it easy to start accepting payments.

The point is that there are a lot of payment methods that you can use. And it is not just about the payment method. IntaSend also has a very high success rate. That means that your payments will go through almost all the time.

IntaSend is also constantly innovating and working on new payment types to ensure they are always ahead of the curve. This makes them the perfect partner for any business that wants to take advantage of the latest payment technologies.

Offline support

You can easily use payment APIs and solutions like USSDs to achieve offline support. Users can use services like PayBills where payments can be collected without the need of internet connection. With payment API like IntaSend API, you are able to capture these payments and auto-reconcile with ease.

Quality design

Payment gateway APIs offer modern designs with features that make it easy for developers to integrate. However, some trade-offs come with using these APIs. One example is that you will likely need to pay a higher transaction fee if you're dealing with a provider that doesn't offer affordable services. But, the upside is that you can get started quickly and easily without worrying about the technical aspects of setting up a payment gateway.

Developers can use the APIs to create applications that make it easy for customers to make payments. The APIs allow developers to create reliable applications, and customers can use that to make payments.

Secure operations

Merchants and customers will love payment gateway APIs because they have enhanced securities and fraud prevention features so everyone can do business without fear. In fact, the payment gateway API is even more secure than the standard payment gateway because the API uses SSL to encrypt all information that is being sent. Plus, the payment gateway API also offers a fraud prevention feature that will help to reduce the chances of fraud occurring.

Payment gateway APIs provide an added layer of security to the payment process by encrypting the customer’s credit card information. In addition, these APIs can also help to prevent fraud by verifying the customer’s identity and checking for suspicious activity. Because of these features, payment gateway APIs have become the preferred way to process payments for many businesses.

Simplified regulatory compliance

Integrating a payment gateway API can help simplify the process of complying with various regulations, so your business always operates within the rules. Using an API can minimize the need for manual data entry and reduce the potential for mistakes. Additionally, integrating a payment gateway can help your business keep up with the latest payment trends.

Many gateway providers offer cutting-edge features that can help you attract and retain customers. For example, some providers offer loyalty programs and rewards that can be integrated with your existing loyalty program. Other providers offer fraud detection and prevention tools that can help you keep your customers’ information safe.

As technology changes, new compliance rules are often put in place. Using an API, your business can quickly adapt to these changes and comply with the latest regulations. Payment gateway API also enables you to receive card payments without the need of undergoing the PCI-DSS certification process yourself.

How To Choose A Good Payment Gateway API

Choosing an ideal payment gateway API may not be as straightforward as many think. The process is tricky as there are things to consider, such as the company, ease of use, documentation, and many more. All these factors play a significant role when choosing a payment gateway API. The company's size and experience are important as they provide a good indication of the quality of the service. The ease of use is another important factor as it will determine how easy it is to use the API.

Selecting the right payment gateway can be difficult and time-consuming, but it’s worth it in the end. The benefits of using the right payment gateway are numerous. Some factors must be considered when choosing a payment gateway API to make the best decision.

IntaSend - A Great Place To Start

Now that you’ve explored what payment gateway APIs are and what factors to consider when choosing one, it’s the best time to get familiar with IntaSend - one of the best payment gateway providers in the market today. IntaSend has an impressive array of payment gateway APIs that can be customized to meet your needs.

IntaSend also has a well-developed integrative platform that makes it easy to connect with various payment processors and banks. If you’re looking for a payment gateway provider that can give your business the flexibility it needs, IntaSend is definitely worth considering.

IntaSend offers a wide range of payment gateway APIs, including card and mobile payments, wallet as a service, REST API plugins and SDKs, e-commerce APIs, and many more. So whether you need a payment gateway that can handle a small or large number of transactions, IntaSend has you covered.

IntaSend has an impressive range of payment gateway APIs that let you easily integrate their service into your website or e-commerce store. With so many options and features to choose from, it’s hard to go wrong with IntaSend.

Some of the benefits of using IntaSend's payment gateway APIs include;


If you're looking for a payment gateway provider with a range of options, IntaSend is definitely worth checking out. We offer many payment gateway APIs, including mobile and card payments, e-commerce, and more. Our company's impressive customer support is also worth noting.

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