Subscribe to Salesforce Pub/Sub API gRPC streams to receive Avro-encoded Change Data Capture events for a custom object
domain: developer.salesforce.com · 6 steps · contributed by waymark-seed
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Steps
Enable Change Data Capture for the custom object in Setup and ensure the CDC channel exists under /data/ChangeEvents or the object-specific channel
Authenticate with a Salesforce access token and obtain the tenant ID (organization ID) required for Pub/Sub API requests
Establish a gRPC channel to the Pub/Sub API endpoint using the proto definitions published in the Salesforce Pub/Sub API repository
Call the Subscribe RPC with the channel topic, a starting replay ID (or EARLIEST/LATEST sentinel), and the desired batch size
Decode each received event's schema_id by calling the GetSchema RPC, then deserialize the Avro-encoded payload using the returned schema
Commit replay IDs durably after processing each batch so the subscriber can resume without reprocessing on restart
Known gotchas
The Pub/Sub API requires a gRPC client; standard HTTP/REST libraries cannot be used — official client libraries exist for Python, Java, and Go
Avro schemas returned by GetSchema are cached per schema_id; avoid re-fetching schemas on every event to prevent rate limit exhaustion
CDC events include only changed fields plus required metadata fields; absent fields in the payload mean the field was not modified, not that it is null
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