iyzipay | WHMCS Module for iyzico Payment Gateway | Ecommerce library

Your first console is getting called before the request gets complete. When waited for 1 sec request is completed and response is stored in the returnData variable. So for your requirement try using promise or call a function to store the response from the create payment function itself with the response as a parameter.

Looks like the issue is here.

So the issue is that the script that's injected by iyziInit.createTag(); expects the iyziInit variable to be defined in the global scope (attached to window).

Here's an example below that works and shows the form.

You changed the value of request in your code in line

Not sure but Assuming the output you provided is string that comes from requesting another data source; You can use JSON field extraction regex like this. Note that $responseString is the response body like the one you had in question.

You need to terminate a Cloud Function when all the asynchronous work is completed, see the doc. In the case of a background triggered Cloud Function (e.g. Cloud Firestore function onCreate trigger, like your Cloud Function) you must return the chain of Promises returned by the asynchronous method calls.

I don't know the Iyzipay service nor the corresponding Node.js library, but it seems that there is no "promisified" version of the iyzipay.payment.create method. You should therefore wrap it in a Promise and chain this Promise with the Promise returned by the Firestore asynchronous set() method, as follows (untested).

Firestore triggers do not have the same API as HTTP triggers. If you want to write a Firestore trigger, you should follow the instructions in the documentation. I recommend starting a whole new function, make it work for a simple case, then port your existing code into it.

Note that Firestore triggers don't have res or req objects, as there is no direct interaction with a client app. You can't send a response to the app, because there is no client app that directly invoked it. The Firestore event is handled asynchronously, after the write completes, and the app has moved on to do other things.

I think you need to move your request logic into the .then(...) block because right now it looks like you're trying to use the document result outside of the block where it is actually returned, which might be why you're getting an "invalid card number" error.

The Firestore API uses Promises for most/all fetch operations so you'll always need to wait for the result before using it.

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