Between versions 1.2.0 and 1.6.5, there is a non-backward compatible change in the configuration of BigQuery Kafka connector on Aiven.

In version 1.2.0, credentials field is used to specify the Google Cloud credentials in JSON format:

...
"credentials": "{...}",
...

In version 1.6.5 or later, please use keyfile field for this and also set keySource=JSON (as described here):

...
"keyfile": "{...}",
"keySource": "JSON",
...

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