curl --request GET \
  --url https://api.withflex.com/v1/consumer/user_providers \
  --header 'Authorization: Bearer <token>'

{
  "user_providers": [
    {
      "user_provider_id": "f9e8d7c6-b5a4-3210-fedc-ba9876543210",
      "customer_id": "obj_01EXAMPLE00000000000000000",
      "provider_id": "f9e8d7c6-b5a4-3210-fedc-ba9876543210",
      "test_mode": false,
      "created_at": "2024-01-01T00:00:00Z",
      "updated_at": "2024-01-01T00:00:00Z"
    }
  ]
}