* handle plain options passed to registerPaymentMethod:
- no need for a callback dance
- support the previous API: if a function is passed, call it as before
* update Stripe for new registerPaymentMethod interface
* update docs & all built-in payment methods to simpler API
* handle plain options arg to registerExpressPaymentMethod:
- add legacy fallback if passed a function
- update stripe express payment method
- update docs
- remove unused `assertValidPaymentMethodCreator` util
* use correct case for `JavaScript`
Co-authored-by: Darren Ethier <darren@roughsmootheng.in>
* typedefs for payment registration options + tidies for regular methods
* typedef express payment options arg & tidy stripe/payment-request:
- use camelCase for config instance (not a constructor/type)
* mention typedefs in payment method dev docs
* use @wordpress/deprecated to warn if callback passed to payment register
* update unit tests for new payment method API
Co-authored-by: Darren Ethier <darren@roughsmootheng.in>