Product and documentation updates for SimZ clients
Use this changelog to track notable SimZ documentation and client-facing API updates.
June 16, 2026
Lead Receive credit preflight check
The Lead Receive Service now verifies the company’s available credit balance before creating or queueing a lead batch.
- If the account has zero or negative credits, the request returns
402 Payment Requiredwithcode: "INSUFFICIENT_CREDITS". The batch is not created and no leads are queued. Add credits, then resubmit. - If the credit balance cannot be verified, the request fails closed and returns
503 Service Unavailablewithcode: "BILLING_CHECK_FAILED". No leads are queued — retry shortly.
See Errors and Rate Limits for the full response shapes and retry guidance.
