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VertexSMS — Authentication & Access

From the official VertexSMS API docs. Every request is authenticated with an access token.

Model

VertexSMS uses a single access token passed as the at query parameter on every request — there is no OAuth/bearer flow:

https://api.vertexsms.com/sms?at=<your-access-token>

The token is issued in your VertexSMS account. Keep it secret; it authorises sending on your account's balance.

To obtain credentials

  • Create a VertexSMS account and generate an API access token.
  • Register at least one Sender ID (POST /senderId, then confirm) before sending on most routes.
  • [confirm on onboarding]: token rotation, IP allow-listing, per-route balance/limits, and whether a separate test token / testMode is used for sandboxing.