Reserve Payment with Checkout Pane

Problem/Motivation

During the checkout flow we need reserve the payment to get a credit check; we cant do this during the createPaymentMethod() function because we don't have the order and need to include the value.

Proposed resolution

Following the example in GoCardless we create a checkout pane on the review step. It will reserve the payment and the state "Credit approved" or redirect back to the previous step with a credit declined message.