Why doesn't google pay api work and gives 500 error?

Question

PHP

Good evening. Question...
(did I choose the tags correctly)
I made a button on the site with which you can save the organization's loyalty card to your phone.
I have such a thing

After clicking, a window opens

It would seem that everything is OK, clicked - added ...
But I can’t understand, after clicking in the console I get a 500 error and the map is not
added I don't understand... I use libraries from Google

IMHO did everything according to the manual here
using
PHP one to one... The
question is what's wrong then? I already broke my head while thinking - I decided to write here, because my samovar has already melted :(