Only customer, address, and business information may be changed for a transaction created to update a payment method.

Error Message	You can't make changes to a transaction where the `origin` is `subscription_payment_method_change`, except to update customer, address, or business information.
Error Code	`transaction_payment_method_change_field_immutable`
Status Code	`400`

Common causes

You're trying to update a transaction where the origin is subscription_payment_method_change. Only customer_id, address_id, or business_id can be changed.

Payment method change transactions are zero-value transactions created by Paddle for updating a payment method against a subscription. Update the related subscription or bill for one-time charges to bill items to a subscription.
To update the address for a payment method, remove fields other than customer_id, address_id, or business_id from your request.