Use the linked-institution/session/complete endpoint to complete a session for linking external financial institutions through various providers. This endpoint finalizes the linking process after the user has finished the provider's flow (either via a hosted URL or SDK experience). Pass in the linkedInstitutionSessionId returned from the Create Linked Institution Session endpoint.
If you provided a hosted URL experience to the user, you must pass in the linkedInstitutionSessionId. If you provided an SDK experience, please pass in the publicToken (under the providerOptions object) received from the provider after the user finishes the linking process (Plaid only).
This endpoint will return the linked institutions created or updated during the session, along with a list of accounts for each institution. You can use the linkedInstitutionId returned in the response to further manage or interact with the linked institution. You can also use the linkedInstitutionAccountId to perform balance checks via Check Linked Institution Account Balance or create an ACH account via Create ACH Account.