> For the complete documentation index, see [llms.txt](https://developers.gleantap.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.gleantap.com/update-data/send-sms-notification.md).

# Send SMS Notification

## Send SMS notification

> Send an SMS notification to a specific contact

```json
{"openapi":"3.0.0","info":{"title":"Gleantap External API","version":"1.0.0"},"tags":[{"name":"Notifications","description":"Notifications"}],"servers":[{"url":"https://api.gleantap.com","description":"Production server"}],"paths":{"/v2/ExternalApi/sendSmsNotification/{app_id}":{"post":{"tags":["Notifications"],"summary":"Send SMS notification","description":"Send an SMS notification to a specific contact","operationId":"fb29614b0a0a451822933fc6ad466881","parameters":[{"name":"X-API-KEY","in":"header","description":"Your API key","required":true,"schema":{"type":"string"}},{"name":"X-SECRET-KEY","in":"header","description":"Your Secret key","required":true,"schema":{"type":"string"}},{"name":"app_id","in":"path","description":"Application ID","required":true,"schema":{"type":"string"}}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"required":["to_number","message"],"properties":{"_id":{"description":"Unique Gleantap Contact ID for personalization","type":"string"},"to_number":{"description":"Recipient phone number with country code","type":"string"},"message":{"description":"SMS message content","type":"string"},"from_number":{"description":"Sender phone number (optional)","type":"string"}},"type":"object"}}}},"responses":{"200":{"description":"SMS sent successfully","content":{"application/json":{"schema":{"properties":{"status":{"type":"boolean"},"message":{"type":"string"},"phone":{"type":"string"},"from":{"type":"string"},"service_type":{"type":"string","enum":["twilio","ringcentral","telnyx","edgility"]},"service_message_id":{"type":"string"}},"type":"object"}}}},"400":{"description":"Invalid request parameters"},"401":{"description":"Unauthorized - Invalid API credentials"},"500":{"description":"SMS sending failed"}}}}}}
```