Adds support for SEPA Direct Debit and Bacs Direct Debit mandate reference prefixes in Checkout Sessions

What’s new

We added the following API parameter to payment method options for SEPA Direct Debit and Bacs Direct Debit in Checkout Sessions:

This change lets you specify mandate options when using Checkout with SEPA Direct Debit or Bacs Direct Debit.

You can specify a prefix in the mandate_options.reference_prefix parameter to customize either the SEPA Direct Debit Mandate reference or Bacs Direct Debit Mandate reference in Payment and Setup modes.

Parameter	Change	Resources or endpoints
mandate_options	Added	Checkout.Session#create.payment_method_options.bacs_debit Checkout.Session#create.payment_method_options.sepa_debit Checkout.Session.payment_method_options.bacs_debit + 1 more Checkout.Session.payment_method_options.sepa_debit

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