WhiteRabbit.Processor.consume_payload

You're seeing just the callback consume_payload, go back to WhiteRabbit.Processor module for more information.
Link to this callback

consume_payload(processor_payload, processor_meta)

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Specs

consume_payload(processor_payload(), processor_meta()) ::
  {:ok, tag()} | consume_error()

Callback function to process payload from a message.

Must return {:ok, delivery_tag()} tuple to allow for proper ack.

Or {:error, reason} tuple for rejects.