curl --request GET \
  --url https://api.onstacks.io/v1/providers \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "items": [
      {
        "id": "<string>",
        "environment": "sandbox",
        "code": "<string>",
        "name": "<string>",
        "supports_auto_routing": true,
        "supported_payout_methods": [
          "<string>"
        ],
        "provider_type": "<string>",
        "reliability_score": 123,
        "speed_profile": "<string>",
        "supported_corridor_ids": [
          "3c90c3cc-0d44-4b50-8888-8dd25736052a"
        ],
        "metadata": {}
      }
    ]
  },
  "error": null,
  "request_id": "<string>"
}