I want to integrate the first data API to my website for card transactions, but I am not able to find the proper documentation to integrate with react and node js.
I have found an npm module, but it seems very old. https://www.npmjs.com/package/firstdata
Their official page also doesn't seem to work out https://developer.firstdata.com/marketplace/api/index.html#authentication
So please guide me to find a proper way to do it.
Note: I am from India
