Draft Order GraphQL API suddenly not working

[AndyHung]

Hello everyone,

We're currently experiencing an issue with our app's usage of the Draft Order GraphQL API. It seems that the invoiceUrl  is returning null intermittently, resulting in orders not being created correctly. Strangely, after a few hours, everything seems to resume normal operation.

Has anyone else encountered this problem? Your insights or any solutions you've found would be greatly appreciated. Thank you!