This PR adds support for the Mollie Orders API to be able to use the Klarna Pay Now, Klarna Pay Later and Klarna Pay Over Time ('Slice It') payment methods as discussed in https://github.com/pronamic/wp-pronamic-pay/issues/190.
[x] Create orders for Klarna payment methods through MemberPress
This PR adds support for the Mollie Orders API to be able to use the Klarna Pay Now, Klarna Pay Later and Klarna Pay Over Time ('Slice It') payment methods as discussed in https://github.com/pronamic/wp-pronamic-pay/issues/190.