const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    label: '<string>',
    prices: [{pricePerUnitCents: 1}],
    description: '<string>',
    substrate: '<string>',
    appliesToScope: '<string>',
    currency: 'GBP',
    activeFrom: '2023-11-07T05:31:56Z',
    activeUntil: '2023-11-07T05:31:56Z',
    createdBy: '<string>',
    activateOnCreate: false
  })
};

fetch('https://sandbox.api.enfinitos.com/v1/rate-cards', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "ok": true,
  "data": {
    "rateCard": {
      "id": "<string>",
      "orgId": "<string>",
      "version": 123,
      "label": "<string>",
      "description": "<string>",
      "activeFrom": "2023-11-07T05:31:56Z",
      "activeUntil": "2023-11-07T05:31:56Z",
      "supersedesCardId": "<string>",
      "supersededByCardId": "<string>",
      "prices": [
        {
          "pricePerUnitCents": 1
        }
      ],
      "targeting": {
        "currency": "<string>",
        "substrates": [
          "<string>"
        ],
        "counterpartyIds": [
          "<string>"
        ],
        "appliesToScope": "<string>"
      },
      "createdBy": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z",
      "approvedBy": "<string>",
      "approvedAt": "2023-11-07T05:31:56Z",
      "approvalNotes": "<string>"
    }
  },
  "contractVersion": "<string>"
}