Starts iDenfy + AML flow for buyers created with kycMode: NT24_LED.
Returns 400 on Mode A buyers.
OAuth 2.0 client_credentials grant via Keycloak service account.
Clients are provisioned per IntegrationOrganization in the
nt24-idp realm.
Client-generated unique key (UUID recommended) for this write operation.
Identical key + identical body within 24h returns the cached response.
Identical key + different body returns 422.
1 - 255UUID of the seller trade partner (must be in caller's authorized list).
UUID of the buyer trade partner.