All Flower Store In a Box websites will use the same non public endpoints for the checkout:
The base endpoint for creating a checkout session is:
https://www.myweblogin.com/aicheckout/
To view the details of an existing checkout setting:
https://www.myweblogin.com/aicheckout/<ID>
To update the details in a checkout:
https://www.myweblogin.com/aicheckout/<ID>/update
To add the payment token, billing address and complete the order:
https://www.myweblogin.com/aicheckout/<ID>/complete
To cancel an order:
https://www.myweblogin.com/aicheckout/<ID>/cancel