Hey,
To report custom TTS server costs to Vapi's cost analytics, you can use the following:
1.API Endpoint: You should use the /report-costs endpoint to report TTS costs.
2.Data Format: The required data format is JSON. You need to include metadata such as call ID, session ID, and the cost amount.
3.Documentation: Yes, there is documentation available for custom provider cost integration. You can find it in the Vapi developer portal under the API documentation section.
Let me know if you need any more details!