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Add a custom function (tool) to a phone number so the AI can call your own HTTPS endpoint during a call and use the result. Configured per phone number.

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Add a custom function

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phoneNumber
string
required
The phone number in E.164 format, passed in the URL.
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name
string
required
Tool name in snake_case (lowercase letters, numbers, underscores), max 64 characters.
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url
string
required
Your HTTPS endpoint the AI will call. https only.
curl -X POST "https://api.nixflex.com/v1/integrations/custom-functions/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx" \
  -H "Content-Type: application/json" \
  -d '{"name": "check_order_status", "url": "https://your-app.com/order-status"}'

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List custom functions

curl -X GET "https://api.nixflex.com/v1/integrations/custom-functions/number/+447446466847" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx"

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Remove a custom function

Delete a specific function by its id: 
curl -X DELETE "https://api.nixflex.com/v1/integrations/custom-functions/number/+447446466847/FUNCTION_ID" \
  -H "Authorization: Bearer nxf_xxx:nxfs_xxx"

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Notes

  • The number must belong to your account. A number you do not own returns 404.
  • For how custom functions work in a call, see Custom functions.