The best way to execute mutations for extension-only apps

[Luke]

Check this thread:

deliveryCustomizationCreate - function not found

Just wanted to provide an update that we are looking into a better path forward for extension-only apps to activate Functions, but are not able to provide any information at the moment. In the meantime, we recommend: using the GraphiQL app through collaborator access to run the GraphQL mutation using functionId instead of functionHandle in the GraphQL mutation