POST /admin/realms/{realm}/clients/{id}/certificates/{attr}/download
HTTP Example:
POST /admin/realms/{realm}/clients/{id}/certificates/{attr}/download
API Example:
ClientAttributeCertificateResource.getKeystore({'realm': /* name realm name (not id!) */, 'id': /* id id of client (not client-id) */, 'attr': /* attributePrefix */, '$entity': /* config */});