How many "digital purchase" buttons can be?

Hello!
Tell me, who knows how many “Digital purchase” buttons can be simultaneously located on one screen?
I can’t find the error for a long time. When you click button 1 - the user pays the amount A and is sent to the modal screen 1.
When you click on button 2, the user pays the amount B, but is again sent to the modal screen 1.

I checked the links many times, everything is fine, I can’t understand the problem.

Although he paid B, he does not receive the corresponding update.
He gets an update for the amount of A and that’s a problem.

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