4. Register the order reference

This step provides seQura with your final order reference or order number. If you didn't include the order reference in the start solicitation step, send it as soon as the order is confirmed or put on hold.

This allows you to run this sequence:

1. Put the order on hold or confirm it with seQura.
2. Persist the order and generate the order reference.
3. Update seQura's order object with your order reference.

This API call is identical to the previous one, but with merchant_reference.order_ref_1 set. You can also provide an optional second reference in merchant_reference.order_ref_2.