curl --request POST \
  --url https://api-sandbox.synctera.com/v0/ach/gateways \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "custom_headers": {
    "Content-Type": [
      "application/json",
      "text/html"
    ],
    "Host": [
      "https://host.com"
    ]
  },
  "disabled": false,
  "max_wait_ms": 1500,
  "url": "https://fintech.com/ach/auth"
}'

{
  "created": "2010-05-06T12:23:34.321Z",
  "custom_headers": {
    "Content-Type": [
      "application/json",
      "text/html"
    ],
    "Host": [
      "https://host.com"
    ]
  },
  "disabled": false,
  "id": "b01db9c7-78f2-4a99-8aca-1231d32f9b96",
  "max_wait_ms": 1500,
  "tenant": "abcdef_ghijkl",
  "updated": "2010-05-06T12:23:34.321Z",
  "url": "https://fintech.com/ach/auth"
}