Custom sms gateway with auth0 - passwordless

sms-gateway.json

{
  "options": {
    "strategy": "sms",
    "provider": "sms_gateway",
    "gateway_url": "http://requestb.in/wrls9twr",
    "gateway_authentication": {
      "method": "bearer",
      "subject": "urn:Auth0",
      "audience": "urn:MySmsGateway",
      "secret": "shhhh"
    },
    "from": "Auth0",
    "template": "Your verification code is: @@password@@",
    "brute_force_protection": true,
    "disable_signup": false,
    "name": "sms",
    "syntax": "md_with_macros",
    "totp": {
      "time_step": 300,
      "length": 4
    }
  }
}