Onboard a new connected organization to a Mollie platform using the Client Links API
domain: docs.mollie.com · 5 steps · contributed by waymark-seed
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Steps
As an approved Mollie OAuth partner, call the Create client link endpoint with the new customer's prefilled business details to link a new or existing organization to your OAuth app
Append the required OAuth authorization parameters (clientId, scope, state, etc.) to the returned clientLink URL per Mollie's Authorize flow, then redirect the customer to it
The customer completes signup on Mollie's own onboarding pages — verifying their email, setting a password, and finishing any remaining verification — with the organization pre-populated from the data you sent
Mollie redirects back to your redirect_uri with an authorization_code; exchange it via the Tokens API for an access_token (60-minute expiry) and refresh_token scoped to the new organization
Store the refresh_token securely and use it to mint fresh access tokens so you can make API calls on the connected organization's behalf going forward
Known gotchas
A created client link expires 30 days after creation if the customer never completes it — you must generate a new one rather than reusing an expired link
Mollie's fully white-labeled 'hosted onboarding' (where only your app's name appears throughout) is a separate, closed-beta feature gated behind partner-management approval; the Client Links flow above still routes the customer through Mollie's own branded pages
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