Why is the documentation so poorly described?

Question

Classmates

Good afternoon. That’s the problem, I can’t set up callbacks payment, more precisely, it’s not clear from the documentation what and where to do, I put my keys where necessary, but what’s next? dead end. When trying to pay, it saves 2 requests:

and the answer to the payment request from classmates comes:

xml while

<ns2:error_response xmlns:ns2="http://api.forticom.com/1.0/">
<error_code>3</error_code>
<error_msg>
CALLBACK_INVALID_PAYMENT: invalid payment data. Please try again later. If error repeats, contact application support team.
</error_msg>
</ns2:error_response>

I can’t understand what and where to write ... Urgently need help

Answer 1

https://apiok.ru/wiki/pages/viewpage.action?pageId...
1) Check that you have configured the Callback URL link
2) The script itself contains the correct parameters - https://apiok.ru/wiki/pages /viewpage.action?pageId...