I want to know that How I can integrate it with Shopify? Or is this possible or not?
I have seen one more thread in the community which is a few months old, and looks like it is outdated(see this link), as it lists only a few supported payment provider in which the Realex is not listed, but as per Realex website, Apple and Google Pay is supported.
While Realex Payments may support Apple Pay and/or Google Pay, these features are not supported within the Shopify Checkout.
Google Pay Supported Payment Providers:
Apple Pay Supported Payment Providers:
First Data Payeezy
You will need to use one of the payment providers listed above if you would like to offer either Apple Pay or Google Pay. Some of these payment providers are region-specific so I would recommend reviewing the list of available payment providers for your country by clicking your country in the list here.
Trevor | Community Moderator @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog