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POST
/
whatsapp
cURL
curl --request POST \
  --url https://api.contiguity.com/send/whatsapp \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "to": "+1234567890",
  "message": "Hello, world!",
  "from": "+15555555555",
  "fallback": {
    "when": [
      "whatsapp_unsupported",
      "whatsapp_fails"
    ],
    "from": "+15555555555"
  },
  "attachments": [
    "https://example.com/image.png"
  ]
}
'
{
  "id": "req_xxxxxxxxxxxxxxxx",
  "timestamp": 1761968887641,
  "api_version": "v2025.10.31",
  "object": "response",
  "data": {
    "message_id": "wapp_1234567890"
  }
}
Only customers who lease numbers that support WhatsApp can use this endpoint.
Phone numbers must be in E.164 format with country codes.

Authorizations

​
Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Body

application/json
​
to
string
required

Recipient's WhatsApp number. Must be in E.164 format.

Example:

"+1234567890"

​
message
string
required

The WhatsApp message to send

Example:

"Hello, world!"

​
from
string

Your leased WhatsApp number. If none is provided, we will use a random WhatsApp number of yours.

Example:

"+15555555555"

​
fallback
object

Should Contiguity fallback to SMS/RCS if the recipient does not have WhatsApp, or if WhatsApp fails to send?

Example:
{
  "when": ["whatsapp_unsupported", "whatsapp_fails"],
  "from": "+15555555555"
}
​
attachments
string[]

Attachments to send. Must be HTTPS-secured URLs with file extensions. Max 10 attachments, with a cumulative size of 50MB.

Maximum array length: 10
Example:
["https://example.com/image.png"]

Response

Send a WhatsApp message

​
id
string
required
Example:

"req_xxxxxxxxxxxxxxxx"

​
timestamp
number
required
Example:

1761968887641

​
api_version
string
required
Example:

"v2025.10.31"

​
object
string
required
Example:

"response"

​
data
object
required