Where did these values even go?

/m/payment/finalize_checkout/stripe_v3/8?mode=payment&order_id=pi_3P7Vj8RvhaF0CXNc1t82AJi1&customer_id=WhereIsIt&pending_id=23&redirect=WhereIsIt? :

Where I placed "WhereIsIt?" there should be something there but they are coming back as null for both variables. It's as if they get lost in the mix during the processing. It's really sad that @LeonidS had made no attempt to further research this and would rather place the blame on you.

You may want to look into a charge back if the service isn't working as intended.