Key insights into how we created a custom Shopify payment gateway for paycertify payment provider through their payment gateway api integration

custom shopify payment gateway

Custom Shopify Payment Gateway Development For Paycertify

Categories E-commerce | Payment Gateway Solutions | Shopify

With a user base of over 600,000 businesses in over 175 countries and being preferred choice of Red Bull, Nestle, Kylie Cosmetics, and others, Shopify is one of the most successful CMS solutions to run Ecommerce stores.

Being an economical, easy to use, and self hosted CMS, Shopify allows merchants to build professional eCommerce websites in minimal time. Then again, if the need of tailor made solutions arises, a vast community of Shopify developers is available to build custom solutions.

Irrespective of the CMS, an eCommerce website needs to handle several transactions each day. These needs to be backed up by a secure online payment method at all times.

The need for Shopify custom payment gateway integration

Shopify fulfill this need through it’s own online payment method called “Shopify payments powered by Stripe”. Additionally, there are around 1000 payment gateways available to merchants in the Shopify admin panel.

However, not all payment methods works in every country. For instance, “Shopify Payments” works only in the United States. Due to similar restrictions or in many instances high transaction fees, merchants do not find a compatible payment gateway for their stores. This creates opportunities for local online payment gateway services that don’t have any out of the box Shopify solutions. This creates opportunities for local online payment gateway services that don’t have any out of the box Shopify solutions. Getting a Shopify based custom payment gateway developed from a technology partner makes it easy for merchants to integrate their Shopify store and offer payment options through the payment gateway.

Being a reputed Shopify development agency experienced in implementing Shopify custom payment gateway integration, we aim to clarify the process that lets local payment gateways set up custom payment methods for Shopify merchants.

As a bonus, we will also share our experience in assisting “Paycertify” payment service provider in developing a custom Shopify payment method.

Things to know before building a Shopify custom payment gateway

There are two ways through which one can integrate custom payment method in Shopify.

i. Using Shopify Hosted Payment SDK

Shopify provides it’s Hosted Payment SDK to integrate a hosted payment page with Shopify checkout. All Hosted Payment SDK integrations use a full page redirect on the payment step.

Pros: Through this approach, the custom payment option is hosted with Shopify and gets listed in the Shopify’s list of payment gateways for all Shopify merchants.

Cons: Access to the Hosted Payment SDK is limited and the payment gateway provider needs to fill up and submit the Shopify Hosted Payment SDK Request Form to be considered for approval. The Shopify team takes around 30 days to review the request depending on the submitted form.

ii. Manual Integration

The workaround, that is adopted by a majority of custom payment gateway providers is by manually hosting the app on their own web server.

Pros: This approach does not need Shopify hosted payment SDK or any post-development verification by Shopify. Virtually any payment gateway provider can hire Shopify developer and setup a custom payment method.

Cons: The manual integration process means the application is not hosted by Shopify. In other words, the application will need to be marketed by the payment provider himself.

Additionally, Shopify doesn’t allow an app to make additions on it’s checkout page without the consent of the merchant using it. Hence, to make the Shopify custom payment gateway option visible, the merchants will need to perform an extra step (in most cases adding a custom script provided in the application documentation) that authorizes the application to enhance Shopify’s default customization process and become visible in the available payment options list.

How secure are self-hosted payment applications?

Self-hosted payment applications (if done) right are as secure as a payment application hosted by Shopify. The Shopify custom App development team at The Brihaspati Infotech always use full page redirect that allows the payment processor to handle security and encryption at the time of payment. Besides this, we use Shopify coding standards and server security best practices to keep both application and the hosting completely secure.

This way, we never store any client sensitive data such as : Card details, Passwords etc, in the website, hence not allowing any chance to hackers for compromising customer data.

Developing custom Shopify payment method for PayCertify

One of our most recent experience had us working as Shopify solution provider for Paycertify : a secure and reliable merchant payment service that provides unique features such as :

  • Customer identity validation.
  • Fraud detection and prevention.
  • Auto Void, refund and cancel payments.
  • Alert and Chargeback management.

We followed the manual approach that involved self hosting the application code on client server.

The Shopify payment gateway development involved:

  1. i) Building a custom user interface for Shopify merchants to manage their PayCertify accounts.

Utilizing Core PHP and HTML, we built the merchant dashboard. Once compiled as a Shopify application, the dashboard (hosted on client’s server) is called into the application container through an Iframe. This way, merchants could access their PayCertify account options within the Shopify admin panel.

paycertify admin interface

  1. ii) Building custom payment interface visible to the buyers

With the back-end structure in place, the front-end steps for buyers were also coded on the client’s server . The payment process begins when the customer selects Paycertify as the payment method

shopify custom payment

Once done, the application redirects him to Paycertify’s server for making the payment. 

paycertify payments shopify

With the payment done, the customer is automatically redirected back to the store.

shopify custom payments

iii) Integrating Paycertify API

To make the merchant interface functional, we integrated Paycertify’s API to fetch relevant merchant data from their pay certify account into the app. The data is received using a PHP script that runs twice a day based on a cron job.

To make sure each merchant gets access to only his data, merchants are given an API Token while signing up for a Paycertify merchant account. They need to enter this API Token while installing the Shopify app into their stores.

The secure token let’s the app differentiate between customers and show relevant data to the merchant.

paycertify app settings

  1. iv) Integrating Shopify API

Last but not the least, we integrated the Shopify store API with our app. It allowed us to listen to store updates such as:

  • New order creation
  • Request for payment
  • Order cancellation etc.

Based on these events, the application suggests necessary actions required from the merchant’s end.

For instance, in an event of a refund request, the Shopify custom payment method allows the merchant to process a refund from his Paycertify account without leaving the Shopify dashboard.

paycertify backend panel


Paycertify is certainly not one of its kind payment application for Shopify. There may be several other competitors claiming to enable Shopify apps with payment gateway. What makes Paycertify unique is how they realized the need of their audience and provided them with a plug and play solution.

A Shopify custom payment gateway will definitely provide a competitive edge to local payment gateway services by exposing them to merchants who are looking for effective solutions.

Are you looking to implement custom payment method in Shopify? Then contact us to hire the best shopify development team offshore and book your consultation today.