Retrieve sales tax filing history, due dates, and filed-return artifacts using the Zamp Filings API
domain: developer.zamp.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Authenticate requests to the Zamp API with an Authorization Bearer token header
Call the filings list endpoint to retrieve a paginated list of filing records for your company, using the cursor parameter to page through results
Filter results with the state, minDueOn, maxDueOn, and isCompleted query parameters to find specific filings, such as all incomplete filings in a given state due in a given month
Read the period, frequency, dueOn, and estimatedTaxDue fields on each filing object to understand the filing's cadence and liability
For completed filings, read the artifacts array to get return and payment confirmation numbers, the amount paid, and signed URLs for the filed return and payment documents
Known gotchas
The companyId query parameter is reserved for Zamp partner accounts, not standard sellers; do not expect it to work on a normal single-company API token
A null cursor value means there are no more pages; treat it as the pagination end condition, not an error
Artifact signed URLs are time-limited download links; fetch and store the underlying documents promptly rather than persisting the URLs for long-term retention
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