Zernio
Zernio
API Reference

SMS

Messaging

Send an SMS/MMSPOSTLook up carrier + line typeGETList SMS opt-outsGET

Number Setup

Enable SMS on a numberPOSTDisable SMS on a numberDELETEAdd number to SMS registrationPOST

Registrations

List carrier registrationsGETPre-check a carrier registrationPOSTStart a carrier registrationPOSTGet a carrier registrationGETCreate a registration share linkPOSTDeactivate a brand/campaign registrationDELETE

Registration Review

Appeal a rejected campaignPOSTReply to a change requestPOSTUpload opt-in form proof for an appealPOSTUpload opt-in form proofPOSTRe-send the sole-prop OTPPOSTSubmit the sole-prop OTPPOST

Sender IDs

List alphanumeric sender IDsGETCreate an alphanumeric sender IDPOSTDelete an alphanumeric sender IDDELETERequest a higher sender ID daily limitPOST
Dashboard
llms.txtOpenAPI
OverviewPlatformsAPI ReferenceResources
SMS

Delete an alphanumeric sender ID

Deactivates the sender ID so it can no longer send. Re-creating the same sender ID via POST /v1/sms/sender-ids re-activates it.

DELETE
/v1/sms/sender-ids/{id}

Authorization

bearerAuth
AuthorizationBearer <token>

API key authentication - use your Zernio API key as a Bearer token

In: header

Path Parameters

id*string

Sender ID resource id.

Response Body

application/json

application/json

application/json

{  "deleted": true}
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Create an alphanumeric sender ID

Registers an alphanumeric sender ID (e.g. `ZERNIO`) — a branded `from` for one-way international SMS. No phone number purchase or carrier registration is needed; once created, pass it as `from` on `POST /v1/sms/messages`. Constraints: 3-11 characters (letters, digits, spaces; at least one letter). Sends cannot reach the US, Canada, or Puerto Rico, are text-only, and recipients cannot reply. Sender IDs that impersonate well-known brands or institutions are rejected. Names are not exclusive: the same sender ID can be registered by any number of workspaces. Creating the same sender ID again is a no-op (re-activates it after a delete).

Request a higher sender ID daily limit

Asks support to raise the workspace's daily sender-ID message cap. There is no self-serve raise: the request (desired cap + use case) is reviewed manually, usually within a business day.