RegisterMerchant

{
    "legalBusinessName": "string",
    "tradingName": "string",
    "country": "GB",
    "owner": {
        "firstName": "string",
        "lastName": "string",
        "email": "user@example.com",
        "phoneNumber": "string"
    },
    "bankDetails": {
        "sortCode": "string",
        "accountNumber": "string",
        "accountHolderDetails": {
            "name": "string",
            "type": "individual"
        }
    },
    "payoutSchedule": {
        "accountType": "essential",
        "config": {
            "type": "instant"
        }
    },
    "marketingOptIn": true,
    "acceptTermsOfUse": true,
    "referrerUrl": "string"
}