[Shadonototro]

You signed a contract that explitly says you have to use their billing API

You choosed their platform, and you agreed with that, so why do you complain now?

EDIT:

Title should be renamed to: "Shopify asks users to comply with contract they signed when joining the platform"

[cush]

Seriously though. It's proper B2B, not Facebook ads. The fact that the Shopify platform is so customizable that it allows integration of 3p billing says a lot about how they view their customers.

Salesforce uses a similar model