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Base URL

All API requests go to a single base URL — there is no version path prefix:
Endpoints sit directly under it, for example:
  • POST /companies
  • POST /expenses/{connectionId}
  • GET /sync/batches/{syncBatchId}
  • POST /companies/{companyId}/integrations/etims/sales
Older examples that used https://api.sync2books.com/v1/... are incorrect — the API is not versioned with a /v1 segment. Drop the /v1.

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Development vs Production

Each application is issued two independent credential sets. The environment is encoded in the key prefix, so you can tell them apart at a glance: Switch environments simply by swapping the API key (and client secret, if you sign requests). Nothing else in the request changes.
For eTIMS specifically, the connection also carries an environment (SANDBOX / PRODUCTION) chosen when the company is provisioned. Use a development API key against a sandbox-provisioned company while testing.

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Interactive API explorer

The always-current, machine-generated schema is published with the running API:
  • Main API (Expenses, sync, eTIMS): https://api.sync2books.com/api
  • OpenAPI JSON: https://api.sync2books.com/api-json
See the API reference for the hand-written endpoint guide.