Modifiy Opencart payment module (NO AUTOBID) Urgent

Job ID: 39367528

Budget: €8 – €30 EUR

Please bid the right price.Autobid not accepted!
I have a working payment module from a bank institute.
I need to modify the front controller to make it work with another bankinstitute ( very similar ) but the api integration is slightly different.

It have to get the auth token (bearer) ( already working )
Create contract with all products in cart and user info ( already working )
Use the auth token and contract info to generate the checkout url ( This part is not working )

Please bid only if you have time and opencart experience otherwise dont't waste your time and my time.

I will provide the model file of the module.

Also i will provide the api integration guideline to modify the model file.

To be clear , it's a modification of ONE single model file the rest is working.

Max 2 days timeline.
Related categories: PHP eCommerce Open Cart OAuth cURL