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Paypal button + coupon code

hey guys,
so my concern is to create a solution where i only use the paypal express button, which i integrated manually, to let customers directly checkout from my homepage (with no checkout process inbetween)

i managed to do this so far but now i want additionally to have the possibility to give my customers coupon codes which they can put in under the paypal button…

till now i found this tutorials:
this is the code:


this is a tutorial:

but i’m afraid that this way will work since it is using a php-script…and we cannot embed php code in the embed-code-element…right?!

so do you have any idea if i can do this and how?!

really racking my brain about this…

cheers

haha nobody here that can help me with this?!