fix: update POSTINSTALL and add invalid arg error

GoogleCloudPlatform / firebase-extensions

Apache License 2.0

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fix: update POSTINSTALL and add invalid arg error #471

Closed cabljac closed 7 months ago

cabljac commented 7 months ago

This PR adds better error handling for 400 errors in the callable, and also updates the POSTINSTALL to contain documentation on the shape of the response data.