Developer docs

Taxjar integration

TaxJar provides a comprehensive sales tax API for real-time tax calculations,…

Updated June 2026 21 actions available

Provider
taxjar
Category
Other
Setup
User-supplied API key
Actions
21 available

Quick start

Call Taxjar from your generated app's worker code via the OverSkill composio client. The toolkit slug below maps to Taxjar's public Composio identifier — your app references it by name and OverSkill handles the OAuth round-trip.

// In your generated app's worker handler:
const composio = composioClient(env);

const result = await composio.execute(
  "TAXJAR_ACTION_NAME",
  { /* action parameters — see Actions section below */ }
);

return new Response(JSON.stringify(result), {
  headers: { "Content-Type": "application/json" }
});

Replace ACTION_NAME with one of the slugs listed in the Actions section below. The composio client handles auth + rate limits automatically — no API key is exposed to user code.

Setup

End-users supply their own Taxjar API key. OverSkill provides a pre-built connection form via the integration card — your app can call the composio client immediately once the user has connected.

Available actions

21 actions exposed via the Taxjar integration. Each maps to a callable slug — pass it to composio.execute(...) in your worker code.

Show all 21 actions
  • TAXJAR_SHOW_CUSTOMER
  • TAXJAR_SHOW_ORDER_TRANSACTION
  • TAXJAR_SHOW_REFUND_TRANSACTION
  • TAXJAR_SHOW_TAX_RATES_FOR_A_LOCATION
  • TAXJAR_SUMMARIZE_TAX_RATES_FOR_ALL_REGIONS
  • TAXJAR_UPDATE_CUSTOMER
  • TAXJAR_UPDATE_ORDER_TRANSACTION
  • TAXJAR_UPDATE_REFUND_TRANSACTION
  • TAXJAR_VALIDATE_VAT_NUMBER

Build with Taxjar

Open OverSkill, describe what you want to build, and reference Taxjar in your prompt — the AI will wire up the integration automatically.