Calling the API

Calls to the Transact API can be made in any programming language. The specific API calls you want to make will depend on your use case and business requirements.

Each API endpoint has its own scope and Resource Owner type (role) requirements, documented for each endpoint under Authorisation Requirements. If your request does not satisfy scope or role requirements, the API will return a 401 Unauthorized HTTP status code. For more information, see Scopes and Roles.

Make a call

All calls to the Transact API must include:

• a Transact-Api-Version header specifying the API version to use
• an Authorization header providing a valid access token using the HTTP Bearer scheme.

For example, using cURL to call GET /advisers might look like the following:

Code
curl \
  -H "Authorization: Bearer <token>" \
  -H "Transact-Api-Version: 2026-05-12" \
  https://apidemo.transact-online.co.uk/advisers

What's next

• Follow a guide
• Browse the API reference
• Learn more about...
  • Environments
  • Scopes and roles
  • Error handling
  • Token claims
  • Pagination
  • Rate limits