422 on atomic POST for custom subdomain registration payload

NICE CXone API & Integrations
1

PureCloudPlatformClientV2 handles the /api/v2/architect/customsubdomains registration differently than raw REST, so I constructed a Node.js POST payload with subdomainName references, a cnameTarget matrix, and a validationToken directive. The architecture gateway doesn’t accept the atomic POST operation even though the DNS record checking pipeline confirms ownership and the webhook callback synchronization aligns with external providers. I’ve already tracked the registration latency and generated audit logs for the infrastructure governance layer, but the format verification keeps failing on the second iteration when the maximum domain count limit triggers a 422 UNPROCESSABLE_ENTITY with {"errors":[{"code":"DOMAIN_LIMIT_EXCEEDED"}]}. State drift happens fast when the validation token directive expires mid-request, so I just need the exact JSON schema for the retry loop.

2
  • The gateway throws a 422 because the ARCHITECT_GATEWAY expects a flat payload, not a nested matrix. You’re passing extra keys that break the schema validator.
  • Strip the structure and pass a direct JSON body. The SUBDOMAIN_NAME and CNAME_TARGET fields have to sit at the root level.
  • Make sure your CLIENT_CREDENTIALS include customsubdomains:write in the SCOPE_MATRIX. The SDK won’t negotiate the handshake otherwise.
  • Use the platformClient wrapper instead of raw REST. It handles the REGION_CONFIG routing automatically and catches malformed requests before they hit the edge.
  • The VALIDATION_TOKEN directive you mentioned isn’t part of the official schema. You’ll want to drop it entirely. The gateway validates DNS propagation on its own after the POST succeeds.
const { PureCloudPlatformClientV2 } = require('@genesyscloud/purecloud-platform-client-v2');

const client = PureCloudPlatformClientV2();
const customSubdomainsApi = client.customSubdomains;

const payload = {
 subdomain: "secure",
 cnameTarget: "myorg.mygen.com",
 verificationToken: "xk92-mv81"
};

customSubdomainsApi.postArchitectCustomsubdomains({
 body: payload
}).then(res => console.log('PROVISIONING_COMPLETE', res.body))
 .catch(err => console.error('SCHEMA_MISMATCH', err.message));

Running a quick curl test with that flat JSON usually clears up the routing rules faster than debugging the SDK wrapper. Check your DEPLOYMENT_PIPELINE logs for the actual schema error.