> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes. # Multi Factor Authentication ## API Docs - Multi Factor Authentication [Request MFA token via call](https://signalwire.com/docs/apis/rest/multi-factor-authentication/request-mfa-call.md) - Multi Factor Authentication [Request MFA token via SMS](https://signalwire.com/docs/apis/rest/multi-factor-authentication/request-mfa-sms.md) - Multi Factor Authentication [Verify MFA token](https://signalwire.com/docs/apis/rest/multi-factor-authentication/verify-mfa-token.md) ## OpenAPI Specification The raw OpenAPI 3.1 specification for this API is available at: - [OpenAPI JSON](https://signalwire.com/docs/apis/rest/multi-factor-authentication/openapi.json) - [OpenAPI YAML](https://signalwire.com/docs/apis/rest/multi-factor-authentication/openapi.yaml)