• REST
  • Java


Digital messages overview

Use the Voiso Digital Messages APIs to send SMS and initiate digital interactions from third-party applications, such as CRMs.


Use the Voiso Outbound SMS API to enable external applications to send SMS. For example, you can use it to enable agents to send an SMS from your CRM.

Limitation: The SMS API does not currently allow you to send bulk SMS.

Send an SMS

The SMS API enables agents to send SMS to contacts from your web application or CRM using a POST request. Request and response payloads are formatted as JSON, using UTF-8 encoding and URL-encoded values.


Use the Voiso WhatsApp outbound messaging API to send messages to contacts.

Send WhatsApp to one or more recipients

Add WhatsApp messaging capabilities to your application.

For example, you can use WhatsApp messaging for the following use cases:

  • As part of an automation flow using a third-party tool.
  • Marketing campaigns that target multiple WhatsApp users.
  • Transactional traffic that sends confirmations to contacts, for example, to confirm an account update.

Note: WhatsApp only supports pre-approved message templates when sending messages to WhatsApp users. Contact your Voiso representative about creating WhatsApp message templates.

Voiso provides two methods to send a message to one or more contacts: Post messages and Get messages. Both methods have the same request and response structure.

Tip: Voiso recommends using the POST method for most applications.


  • There is a throttling limit of 50 API calls per second.
  • There is a maximum of 100 recipients per API call per second. Additional recipients are rejected.

List Templates

Use the Get List templates API to retrieve the list of templates in your contact center.

The following associated details are also retrieved:

  • UUID: WhatsApp template identifier
  • Name: Template name
  • Category: Template type
  • Language: Language used in the template
  • Number: The phone number associated with the template
  • Body: The message text of the template