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

Update template by id

Update one variant's components and/or its message_send_ttl_seconds by its Meta id. Name, language and category cannot change.

Meta only allows editing templates in APPROVED, REJECTED or PAUSED state; an approved template can be edited once per 24 hours and up to 10 times per 30 days. A component update sends the variant back to Meta for review, so the status returned here is normally PENDING; a TTL-only update keeps an APPROVED variant approved. The final outcome arrives on the whatsapp.template.status_updated webhook (which carries the variant's templateId and language). A variant already in PENDING cannot be edited again until Meta finishes reviewing it.

PATCH
/v1/whatsapp/templates/id/{templateId}

Authorization

bearerAuth
AuthorizationBearer <token>

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

In: header

Path Parameters

templateId*string

Meta template id (numeric).

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

Response Body

application/json

application/json

application/json

{  "success": true,  "template": {    "id": "string",    "name": "string",    "language": "string",    "status": "string"  }}
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Get template by id

Retrieve one template variant by its Meta id, the id every variant of a family has on its own and the one the `whatsapp.template.status_updated` webhook carries.

Delete template by id

Delete one language variant by its Meta id. Other languages of the same name are untouched. The name cannot be reused for 30 days once its last variant is deleted.

accountId*string

WhatsApp account ID

components?array<|||||>

Updated template components. Optional when only message_send_ttl_seconds changes; at least one of the two is required.

Items1 <= items
message_send_ttl_seconds?integer

Delivery validity window in seconds: a message not delivered within it is dropped. Range depends on category: AUTHENTICATION 30 to 900, UTILITY 30 to 43200 (12h), MARKETING 43200 to 2592000 (30 days); -1 is not accepted here (Meta treats it as an empty edit); send a value in range. A TTL-only edit keeps an APPROVED template approved, no re-review. Meta defaults to 600 for AUTHENTICATION and 30 days otherwise. If Meta later recategorises the template, it clears the TTL (read it back to check).