Why does AlphaCommerceHub respond `1059` / «Internal Processing Error please resend the request» to a PayPal's `PaymentStatus` API request?

Extensions AlphaCommerceHub
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1

1. Request

1.1. Body

{
    "Header": {
        "MerchantID": "ANTERIOR001",
        "TransactionType": "PaymentStatus",
        "UserID": "<...>",
        "Version": "2"
    },
    "Transaction": {
        "MerchantTxnID": "1208L.772",
        "Method": "PP"
    }
}

1.2. Headers

Request: POST / HTTP/1.1
Accept-encoding: gzip, deflate
Connection: close
Content-Length: 243
Content-Type: application/json
Host: hubapiuat.alphacommercehub.com.au
User-Agent: Mage2.PRO

2. Response

{
    "Banks": null,
    "Country": null,
    "DocumentResults": null,
    "EmailChecks": null,
    "FraudChecks": null,
    "GeoChecks": null,
    "Result": {
        "custom1": null,
        "custom2": null,
        "custom3": null,
        "custom4": null,
        "custom5": null,
        "MerchantID": "ANTERIOR001",
        "MerchantTxnID": "1208L.772",
        "ResponseCode": "1059",
        "ResponseMessage": "Internal Processing Error please resend the request",
        "ResponseTimestamp": "11122017062349"
    },
    "ShippingService": null,
    "TaxResultLines": null
}
2

To solve this error, provide the Transaction.Amount and Transaction.Currency parameters: [AlphaCommerceHub] Where is the response parameters specification for the PayPal’s PaymentStatus transaction?