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

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
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WhatsApp

Get flow preview URL

Get Meta's public web-preview URL for a flow (drafts included), embeddable as an interactive iframe. The link is reused across calls (valid ~30 days); pass invalidate=true to mint a fresh one (the previous link stops working).

GET
/v1/whatsapp/flows/{flowId}/preview

Authorization

bearerAuth
AuthorizationBearer <token>

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

In: header

Path Parameters

flowId*string

Flow ID

Query Parameters

accountId*string

WhatsApp account ID

invalidate?boolean

Mint a fresh preview link (default false)

Response Body

application/json

application/json

{  "preview_url": "string",  "expires_at": "string"}
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Upload flow JSON

Upload or update the Flow JSON for a DRAFT flow. The Flow JSON defines all screens, components (text inputs, dropdowns, date pickers, etc.), and navigation. Meta validates the JSON on upload and returns any validation errors. See: https://developers.facebook.com/docs/whatsapp/flows/reference/flowjson

List flow versions

List the flow's version history (the clone lineage Zernio tracks, since Meta has no native versioning), newest version first. Each entry is enriched with the version's live name and status from Meta. A flow with no lineage returns only itself as version 1.