Happy to help you out with this.
Looking at our logs I am seeing failed responses this past week, and the checkout id’s appear associated with draft orders. However, I’m noticing that in the response your correctly echoing back the x_reference id which is associated to a checkout record tied to a draft order. What API are you using to get the checkout details?
Would you mind running a new test, attempting to complete a draft order with your payment provider and providing the date and time in UTC of that request. It will help me and our payment team in our troubleshooting efforts.
Regards,
John