Changes to Set up billing for the caller

added the new awaiting_card enum value to the trial/state response property for the response status 200

removed the optional property failed_first_purchase from the response with the 200 status

removed the failed_first_purchase enum value from the unavailable/items response property for the response status 200

added the optional property payment_method to the response with the 200 status

added the new expired enum value to the trial/state response property for the response status 200

added the optional property balance/next_expiry to the response with the 200 status

added the optional property trial/credit_expired_cents to the response with the 200 status

added the optional property trial/expires_at to the response with the 200 status

added the new withheld enum value to the trial/state response property for the response status 200

added the required property balance/granted_cents to the response with the 200 status

endpoint added