1. Read /v2/connectors and filter by the required supported platform. Follow the returned pagination and inspect the publication's name, version, documentation and artifact.
2. Select the artifact ID from that eligible publication. Check that it matches the billing platform you intend to install.
3. Request download-token with an idempotency key. Save the returned token, artifact digest and expires_at.
4. Immediately request the artifact's download endpoint with the token. You can use X-Download-Token to avoid placing the token in the query string.
5. Save the binary ZIP response. Do not pass successful ZIP bytes through your normal JSON-envelope parser.
6. Verify the package digest and inspect the supplied installation instructions before uploading files to the billing platform.

The current grant lifetime is 120 seconds, but always follow the returned expiry. If a grant has expired or been consumed, obtain a fresh grant. Repeating the old grant request with its original idempotency key may replay the original response rather than produce a new usable token.

If the connection ended after consuming the grant, first check whether the saved ZIP is complete and matches the expected digest. A new download attempt needs its own valid grant. Publication withdrawal or changed account eligibility can prevent a replacement download.

• Build and publish branded billing-platform connectors in Connector Studio
• Roll out a new connector release while retaining a working previous package
• Install the current Nabtech Domain Nexus registrar connector in WHMCS
• Retry Domain Nexus requests without creating duplicate domain operations