curl --request POST \
  --url https://api.interchange.io/api/v2/storefront/signals \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "signalId": "<string>",
  "name": "<string>",
  "keyType": []
}
'

{
  "signal": {
    "id": 0,
    "signalId": "<string>",
    "adcpAgentId": 0,
    "name": "<string>",
    "description": "<string>",
    "keyType": [],
    "regions": [],
    "metadata": {},
    "isLive": true,
    "archivedAt": "2023-11-07T05:31:56Z",
    "createdBy": "<string>",
    "updatedBy": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z"
  },
  "access": [
    {
      "id": 0,
      "signalId": 0,
      "seatId": 123,
      "price": {
        "pricing_option_id": "<string>",
        "pricing_model": "cpm",
        "currency": "<string>",
        "fixed_price": 1,
        "floor_price": 1,
        "max_bid": true,
        "price_guidance": {
          "p25": 1,
          "p50": 1,
          "p75": 1,
          "p90": 1
        },
        "min_spend_per_package": 1,
        "price_breakdown": {
          "list_price": 123,
          "adjustments": [
            {}
          ]
        },
        "eligible_adjustments": [
          "fee"
        ]
      },
      "archivedAt": "2023-11-07T05:31:56Z",
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ]
}