Payment Customization Function activation without app UI or hosting (extension-only app)

[Luke]

I already shared this in the thread you posted in.

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