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In order to authenticate, you need to get your credentials by signing up to the Developer Portal (for more details on the process cf. Get started). For each API call, you will need to include those credentials in the following headers: Only in the Sandbox environment, you will also need to provide the following header:
The X-Qonto-Staging-Token header bypasses the OneLogin gate that protects our Sandbox environment for API calls only. If you also need to open the redirection_link returned by Create a registration in a browser, you have to bypass the gate a different way — see Accessing the Sandbox environment.
The Onboarding Partners API has no API key and no OAuth scopes: every endpoint uses these headers. Each endpoint page reminds them right below its method and URL.