Zernio
Zernio
API Reference

WhatsApp

Templates

List templatesGETCreate templatePOSTGet templateGETUpdate templatePATCHDelete templateDELETEGet template by idGETUpdate template by idPATCHDelete template by idDELETELook up a library templateGET

Business Profile

Get business profileGETUpdate business profilePOSTUpload profile picturePOSTGet display name statusGETRequest display name changePOSTGet business usernameGETGet username suggestionsGETSet business usernamePOSTDelete business usernameDELETE

Groups

List active groupsGETCreate groupPOSTGet group infoGETUpdate group settingsPOSTDelete groupDELETEAdd participantsPOSTRemove participantsDELETECreate invite linkPOSTList join requestsGETApprove join requestsPOSTReject join requestsDELETE

Blocking

Check if a user is blockedGETList blocked usersGETBlock usersPOSTUnblock usersDELETE

Media

Download WhatsApp mediaGET

Commerce

List the catalogs linked to a WhatsApp numberGETLink a catalog to a WhatsApp numberPOSTUnlink a catalog from a WhatsApp numberDELETEGet a number's commerce settingsGETUpdate a number's commerce settingsPUT

Conversions

Get CTWA conversions datasetGETProvision CTWA datasetPOSTList conversion eventsGETSend WhatsApp conversion eventPOST

Account Events

List account notificationsGET

Phone Numbers

Get number statusGETRegister a connected WhatsApp number on the Cloud APIPOSTMove a number to another profilePATCHRequest a Meta re-verification code for a BYO WhatsApp numberPOSTVerify the Meta re-verification code for a BYO WhatsApp numberPOST

Calling

Get calling config for an accountGETEnable calling on a numberPOSTUpdate calling configPATCHDisable calling on a numberDELETECheck call permissionGETList call history for an accountGETInitiate outbound callPOSTGet a single callGETEstimate per-minute costGETGet calling config for a numberGETGet a call recordingGETStart caller-ID verification for a customer-brought numberPOSTConfirm the caller-ID verification codePOST

Flows

List flowsGETCreate flowPOSTGet flowGETUpdate flowPATCHDelete flowDELETEGet flow JSON assetGETUpload flow JSONPUTGet flow preview URLGETList flow versionsGETPublish flowPOSTDeprecate flowPOSTSend flow messagePOSTList flow responsesGETGet Flows encryption key statusGETRegister a Flows encryption keyPOST

Sandbox

List your sandbox sessionsGETStart a sandbox activationPOSTRevoke a sandbox sessionDELETE

Other

Get pricing analyticsGET
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WhatsApp

Revoke a sandbox session

Hard-deletes the session. The user loses the ability to send to that phone via the sandbox until they re-activate it. Existing conversations and messages already exchanged with that phone are untouched. Revocation only blocks FUTURE sends.

Sessions belonging to other users cannot be revoked; the response is the same 400 as "session not found" so existence isn't leaked.

DELETE
/v1/whatsapp/sandbox/sessions/{sessionId}

Authorization

bearerAuth
AuthorizationBearer <token>

API key authentication: send your Zernio API key in the Authorization header, prefixed with Bearer.

In: header

Path Parameters

sessionId*string

The session id returned by POST /v1/whatsapp/sandbox/sessions.

Response Body

application/json

application/json

import Zernio from '@zernio/node';const zernio = new Zernio({ apiKey: process.env.ZERNIO_API_KEY });const { data } = await zernio.whatsappsandbox.deleteWhatsAppSandboxSession({  path: {    sessionId: 'session_abc123',  },});console.log(data);
{  "success": true}
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Start a sandbox activation

Creates (or refreshes) a pending sandbox session for the given phone and immediately fires the verified sandbox template from the shared sandbox number to that phone. The session activates when the phone owner replies to that WhatsApp message: the reply itself is proof of ownership. One phone per user: if the caller already has a non-expired session for a DIFFERENT phone, the request is rejected with `invalid_field_value` (the message names the existing phone so it can be revoked first). Re-creating a session for the SAME phone is idempotent and refreshes the verification template. If Meta rejects the template send (not a WhatsApp number, paused WABA, token issue), the pending row is rolled back and the Meta error message is returned in `error` so the caller knows why.

Get pricing analytics

Message volume and approximate cost for one connected WhatsApp number, read live from Meta's `pricing_analytics` on the WhatsApp Business Account and scoped to that account's phone number. Meta's figures are approximate and can lag; Meta bills from its own invoice. Meta limits how far back and how fine the data goes (for example HALF_HOUR only over short ranges) and answers out-of-range requests with an error.