telnyx-messaging-curl

name	telnyx-messaging-curl
description	Send and receive SMS/MMS, handle opt-outs and delivery webhooks. Use for notifications, 2FA, or messaging apps.
metadata	{"author":"telnyx","product":"messaging","language":"curl","generated_by":"telnyx-openapi-pipeline","contract":"v2"}

Telnyx Messaging - curl

Installation

# curl is pre-installed on macOS, Linux, and Windows 10+

Setup

export TELNYX_API_KEY="YOUR_API_KEY_HERE"

All examples below use $TELNYX_API_KEY for authentication.

Error Handling

All API calls can fail with network errors, rate limits (429), validation errors (422), or authentication errors (401). Always handle errors in production code:

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "to": "[phone]",
      "from": "[phone]",
      "text": "Hello from Telnyx!"
  }' \
  "https://api.telnyx.com/v2/messages"

Common error codes: 401 invalid API key, 403 insufficient permissions, 404 resource not found, 422 validation error (check field formats), 429 rate limited (retry with exponential backoff).

Important Notes

• Phone numbers must be in E.164 format (e.g., [phone]). Include the + prefix and country code. No spaces, dashes, or parentheses.
• Pagination: List endpoints return paginated results. Use page[number] and page[size] query parameters to navigate pages. Check meta.total_pages in the response.

Operational Caveats

• The sending number must already be assigned to the correct messaging profile before you send traffic from it.
• US A2P long-code traffic must complete 10DLC registration before production sending or carriers will block or heavily filter messages.
• Delivery webhooks are asynchronous. Treat the send response as acceptance of the request, not final carrier delivery.

Reference Use Rules

Do not invent Telnyx parameters, enums, response fields, or webhook fields.

• If the parameter, enum, or response field you need is not shown inline in this skill, read references/api-details.md before writing code.
• Before using any operation in ## Additional Operations, read the optional-parameters section and the response-schemas section.
• Before reading or matching webhook fields beyond the inline examples, read the webhook payload reference.

Core Tasks

Send an SMS

Primary outbound messaging flow. Agents need exact request fields and delivery-related response fields.

POST /messages

Parameter	Type	Required	Description
to	string (E.164)	Yes	Receiving address (+E.164 formatted phone number or short co...
from	string (E.164)	Yes	Sending address (+E.164 formatted phone number, alphanumeric...
text	string	Yes	Message body (i.e., content) as a non-empty string.
messaging_profile_id	string (UUID)	No	Unique identifier for a messaging profile.
media_urls	array[string]	No	A list of media URLs.
webhook_url	string (URL)	No	The URL where webhooks related to this message will be sent.
...			+7 optional params in references/api-details.md

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "to": "[phone]",
      "from": "[phone]",
      "text": "Hello from Telnyx!"
  }' \
  "https://api.telnyx.com/v2/messages"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.text
• .data.sent_at
• .data.errors

Send an SMS with an alphanumeric sender ID

Common sender variant that requires different request shape.

POST /messages/alphanumeric_sender_id

Parameter	Type	Required	Description
from	string (E.164)	Yes	A valid alphanumeric sender ID on the user's account.
to	string (E.164)	Yes	Receiving address (+E.164 formatted phone number or short co...
text	string	Yes	The message body.
messaging_profile_id	string (UUID)	Yes	The messaging profile ID to use.
webhook_url	string (URL)	No	Callback URL for delivery status updates.
webhook_failover_url	string (URL)	No	Failover callback URL for delivery status updates.
use_profile_webhooks	boolean	No	If true, use the messaging profile's webhook settings.

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "from": "MyCompany",
  "to": "[phone]",
  "text": "Hello from Telnyx!",
  "messaging_profile_id": "550e8400-e29b-41d4-a716-446655440000"
}' \
  "https://api.telnyx.com/v2/messages/alphanumeric_sender_id"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.text
• .data.sent_at
• .data.errors

---

Webhook Verification

Telnyx signs webhooks with Ed25519. Each request includes telnyx-signature-ed25519 and telnyx-timestamp headers. Always verify signatures in production:

# Telnyx signs webhooks with Ed25519 (asymmetric — NOT HMAC/Standard Webhooks).
# Headers sent with each webhook:
#   telnyx-signature-ed25519: base64-encoded Ed25519 signature
#   telnyx-timestamp: Unix timestamp (reject if >5 minutes old for replay protection)
#
# Get your public key from: Telnyx Portal > Account Settings > Keys & Credentials
# Use the Telnyx SDK in your language for verification (client.webhooks.unwrap).
# Your endpoint MUST return 2xx within 2 seconds or Telnyx will retry (up to 3 attempts).
# Configure a failover URL in Telnyx Portal for additional reliability.

Webhooks

These webhook payload fields are inline because they are part of the primary integration path.

Delivery Update

Field	Type	Description
data.event_type	enum: message.sent, message.finalized	The type of event being delivered.
data.payload.id	uuid	Identifies the type of resource.
data.payload.to	array[object]
data.payload.text	string	Message body (i.e., content) as a non-empty string.
data.payload.sent_at	date-time	ISO 8601 formatted date indicating when the message was sent.
data.payload.completed_at	date-time	ISO 8601 formatted date indicating when the message was finalized.
data.payload.cost	object | null
data.payload.errors	array[object]	These errors may point at addressees when referring to unsuccessful/unconfirm...

Inbound Message

Field	Type	Description
data.event_type	enum: message.received	The type of event being delivered.
data.payload.id	uuid	Identifies the type of resource.
data.payload.direction	enum: inbound	The direction of the message.
data.payload.to	array[object]
data.payload.text	string	Message body (i.e., content) as a non-empty string.
data.payload.type	enum: SMS, MMS	The type of message.
data.payload.media	array[object]
data.record_type	enum: event	Identifies the type of the resource.

If you need webhook fields that are not listed inline here, read the webhook payload reference before writing the handler.

---

Important Supporting Operations

Use these when the core tasks above are close to your flow, but you need a common variation or follow-up step.

Send a group MMS message

Send one MMS payload to multiple recipients.

POST /messages/group_mms

Parameter	Type	Required	Description
from	string (E.164)	Yes	Phone number, in +E.164 format, used to send the message.
to	array[object]	Yes	A list of destinations.
media_urls	array[string]	No	A list of media URLs.
webhook_url	string (URL)	No	The URL where webhooks related to this message will be sent.
webhook_failover_url	string (URL)	No	The failover URL where webhooks related to this message will...
...			+3 optional params in references/api-details.md

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "from": "[phone]",
      "to": [
          "[phone]"
      ],
      "text": "Hello from Telnyx!"
  }' \
  "https://api.telnyx.com/v2/messages/group_mms"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.type
• .data.direction
• .data.text

Send a long code message

Force a long-code sending path instead of the generic send endpoint.

POST /messages/long_code

Parameter	Type	Required	Description
from	string (E.164)	Yes	Phone number, in +E.164 format, used to send the message.
to	string (E.164)	Yes	Receiving address (+E.164 formatted phone number or short co...
media_urls	array[string]	No	A list of media URLs.
webhook_url	string (URL)	No	The URL where webhooks related to this message will be sent.
webhook_failover_url	string (URL)	No	The failover URL where webhooks related to this message will...
...			+6 optional params in references/api-details.md

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "from": "[phone]",
      "to": "[phone]",
      "text": "Hello from Telnyx!"
  }' \
  "https://api.telnyx.com/v2/messages/long_code"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.type
• .data.direction
• .data.text

Send a message using number pool

Let a messaging profile or number pool choose the sender for you.

POST /messages/number_pool

Parameter	Type	Required	Description
messaging_profile_id	string (UUID)	Yes	Unique identifier for a messaging profile.
to	string (E.164)	Yes	Receiving address (+E.164 formatted phone number or short co...
media_urls	array[string]	No	A list of media URLs.
webhook_url	string (URL)	No	The URL where webhooks related to this message will be sent.
webhook_failover_url	string (URL)	No	The failover URL where webhooks related to this message will...
...			+6 optional params in references/api-details.md

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "messaging_profile_id": "550e8400-e29b-41d4-a716-446655440000",
      "to": "[phone]",
      "text": "Hello from Telnyx!"
  }' \
  "https://api.telnyx.com/v2/messages/number_pool"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.type
• .data.direction
• .data.text

Send a short code message

Force a short-code sending path when the sender must be a short code.

POST /messages/short_code

Parameter	Type	Required	Description
from	string (E.164)	Yes	Phone number, in +E.164 format, used to send the message.
to	string (E.164)	Yes	Receiving address (+E.164 formatted phone number or short co...
media_urls	array[string]	No	A list of media URLs.
webhook_url	string (URL)	No	The URL where webhooks related to this message will be sent.
webhook_failover_url	string (URL)	No	The failover URL where webhooks related to this message will...
...			+6 optional params in references/api-details.md

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "from": "12345",
      "to": "[phone]",
      "text": "Hello from Telnyx!"
  }' \
  "https://api.telnyx.com/v2/messages/short_code"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.type
• .data.direction
• .data.text

Schedule a message

Queue a message for future delivery instead of sending immediately.

POST /messages/schedule

Parameter	Type	Required	Description
to	string (E.164)	Yes	Receiving address (+E.164 formatted phone number or short co...
messaging_profile_id	string (UUID)	No	Unique identifier for a messaging profile.
media_urls	array[string]	No	A list of media URLs.
webhook_url	string (URL)	No	The URL where webhooks related to this message will be sent.
...			+8 optional params in references/api-details.md

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "to": "[phone]",
      "from": "[phone]",
      "text": "Appointment reminder",
      "send_at": "2025-07-01T15:00:00Z"
  }' \
  "https://api.telnyx.com/v2/messages/schedule"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.type
• .data.direction
• .data.text

Send a WhatsApp message

Send WhatsApp traffic instead of SMS/MMS.

POST /messages/whatsapp

Parameter	Type	Required	Description
from	string (E.164)	Yes	Phone number in +E.164 format associated with Whatsapp accou...
to	string (E.164)	Yes	Phone number in +E.164 format
whatsapp_message	object	Yes
type	enum (WHATSAPP)	No	Message type - must be set to "WHATSAPP"
webhook_url	string (URL)	No	The URL where webhooks related to this message will be sent.
messaging_profile_id	string (UUID)	No	Messaging profile ID - required if the 'from' number is not ...

curl \
  -X POST \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "from": "[phone]",
  "to": "[phone]",
  "whatsapp_message": {}
}' \
  "https://api.telnyx.com/v2/messages/whatsapp"

Primary response fields:

• .data.id
• .data.to
• .data.from
• .data.type
• .data.direction
• .data.body

---

Additional Operations

Use the core tasks above first. The operations below are indexed here with exact SDK methods and required params; use references/api-details.md for full optional params, response schemas, and lower-frequency webhook payloads. Before using any operation below, read the optional-parameters section and the response-schemas section so you do not guess missing fields.

Operation	SDK method	Endpoint	Use when	Required params
Retrieve a message	HTTP only	GET /messages/{id}	Fetch the current state before updating, deleting, or making control-flow decisions.	id
Cancel a scheduled message	HTTP only	DELETE /messages/{id}	Remove, detach, or clean up an existing resource.	id
List alphanumeric sender IDs	HTTP only	GET /alphanumeric_sender_ids	Inspect available resources or choose an existing resource before mutating it.	None
Create an alphanumeric sender ID	HTTP only	POST /alphanumeric_sender_ids	Create or provision an additional resource when the core tasks do not cover this flow.	alphanumeric_sender_id, messaging_profile_id
Retrieve an alphanumeric sender ID	HTTP only	GET /alphanumeric_sender_ids/{id}	Fetch the current state before updating, deleting, or making control-flow decisions.	id
Delete an alphanumeric sender ID	HTTP only	DELETE /alphanumeric_sender_ids/{id}	Remove, detach, or clean up an existing resource.	id
Retrieve group MMS messages	HTTP only	GET /messages/group/{message_id}	Fetch the current state before updating, deleting, or making control-flow decisions.	message_id
List messaging hosted numbers	HTTP only	GET /messaging_hosted_numbers	Inspect available resources or choose an existing resource before mutating it.	None
Retrieve a messaging hosted number	HTTP only	GET /messaging_hosted_numbers/{id}	Fetch the current state before updating, deleting, or making control-flow decisions.	id
Update a messaging hosted number

Other Webhook Events

Event	data.event_type	Description
replacedLinkClick	message.link_click	Replaced Link Click

---

For exhaustive optional parameters, full response schemas, and complete webhook payloads, see references/api-details.md.