curl --request POST \
  --url https://sandbox.api.acountpay.com/v1/partner/merchants/fast-track \
  --header 'Content-Type: application/json' \
  --header 'X-Partner-Client-Id: <api-key>' \
  --header 'X-Partner-Client-Secret: <api-key>' \
  --data '
{
  "companyName": "Restaurant XYZ ApS",
  "contactEmail": "owner@restaurantxyz.dk",
  "registrationNumber": "87654321",
  "website": "https://restaurantxyz.dk",
  "iban": "DK5000400440116243",
  "contactPhone": "+4587654321",
  "partnerRefId": "merchant-001",
  "bic": "DABADKKK",
  "primaryUseCase": "PIS: In store merchant payment",
  "mccCode": "5812",
  "isSoleTrader": true,
  "soleTrader": {
    "fullName": "Anders Jensen",
    "address": "Nørregade 12, 1165 København K",
    "dateOfBirth": "1985-06-15"
  },
  "ubos": [
    {
      "fullName": "Anders Jensen",
      "address": "Nørregade 12, 1165 København K",
      "dateOfBirth": "1985-06-15"
    }
  ],
  "directors": [
    {
      "fullName": "Anders Jensen",
      "address": "Nørregade 12, 1165 København K",
      "dateOfBirth": "1985-06-15"
    }
  ],
  "signatories": [
    {
      "fullName": "Anders Jensen",
      "address": "Nørregade 12, 1165 København K",
      "dateOfBirth": "1985-06-15"
    }
  ],
  "address": {
    "street": "Nørregade 12",
    "city": "København",
    "postalCode": "1165",
    "countryCode": "DK"
  }
}
'

{
  "merchantId": 42,
  "clientId": "a1b2c3d4-e5f6-7890-abcd-1234567890ab",
  "onboardingUrl": "https://partner.acountpay.com/onboarding/abc123...",
  "status": "pending"
}