(Go) Adyen HMAC Signature Calculation for Hosted Payment Pages

See more Adyen Examples

For a C# ASP.NET Razor Pages example showing the HTML Form with HMAC signature code, see Adyen HMAC Signature Calculation in C#

For more information, see https://docs.adyen.com/classic-integration/hosted-payment-pages/hmac-signature-calculation/

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    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success bool

    strHtml := "<table class=\"od\"><tr><th>Description</th><th>Quantity</th><th>Amount</th></tr><tr><td>1 Digital Camera</td><td class=\"r\">1</td><td class=\"r\">100 GBP</td></tr><tr><td class=\"b\">Total</td><td class=\"r\"></td><td class=\"b r\">100.00 GBP</td></tr></table>"

    gzip := Gzip_Ref.html">chilkat.NewGzip()
    gzOrderData := gzip.CompressStringENC(strHtml,"utf-8","base64")

    xml := Xml_Ref.html">chilkat.NewXml()
    xml.SetTag("keyValuePairs")

    xml.NewChild2("orderData",*gzOrderData)

    // required, The payment deadline; the payment needs to occur within the specified time value.
    sessionValidity := "2019-08-11T10:30:00Z"
    xml.NewChild2("sessionValidity",sessionValidity)

    // optional.  Normally we'll let Adyen automatically know the country based on the IP address.
    // By default, the payment methods offered to a shopper are filtered based on the country the shopper's IP address is mapped to. 
    // In this way, shoppers are not offered payment methods that are not available in the country they are carrying out the transaction from. 
    // This IP-to-country mapping is not 100% accurate, so if you have already established the country of the shopper, you can set it explicitly 
    // in the countryCode parameter.
    countryCode := "GB"
    xml.NewChild2("countryCode",countryCode)

    // optional
    shopperLocale := "en_GB"
    // If not specified, the locale preference is set to en_GB   by default.
    // When it is not necessary to include the country-specific part, use only the language code.
    // For example: it instead of it_IT to set the locale preferences to Italian.
    xml.NewChild2("shopperLocale",shopperLocale)

    // required, A reference to uniquely identify the payment. This reference is used in all communication with you about the payment status. 
    // We recommend using a unique value per payment; however, it is not a requirement. If you need to provide multiple references for a transaction, 
    // you can enter them in this field. Separate each reference value with a hyphen character ("-"). This field has a length restriction: 
    // you can enter max. 80 characters.
    merchantReference := "paymentTest1234"
    xml.NewChild2("merchantReference",merchantReference)

    // required, The merchant account identifier you want to process the (transaction) request with.
    merchantAccount := "ChilkatSoftwareIncCOM"
    xml.NewChild2("merchantAccount",merchantAccount)

    // required.  10000 for $100.00
    paymentAmount := "10000"
    xml.NewChild2("paymentAmount",paymentAmount)

    // required, The three-character ISO currency code
    currencyCode := "GBP"
    xml.NewChild2("currencyCode",currencyCode)

    // required.
    skinCode := "S7uWsvfB"
    xml.NewChild2("skinCode",skinCode)

    // optional, A unique identifier for the shopper, for example, a customer ID.
    // We recommend providing this information, as it is used in velocity fraud checks. It is also the key in recurring payments.
    // This field is mandatory in recurring payments.  
    shopperReference := "somebody@example.com"
    xml.NewChild2("shopperReference",shopperReference)

    // optional
    shopperEmail := "somebody@example.com"
    xml.NewChild2("shopperEmail",shopperEmail)

    // optional, An integer value that adds up to the normal fraud score.
    // The value can be either a positive or negative integer.
    xml.NewChild2("offset","0")

    // Apparently this is a required field.
    shipBeforeDate := "2019-06-04"
    xml.NewChild2("shipBeforeDate",shipBeforeDate)

    xml.SortByTag(true)

    // Encode...
    //  "\" (backslash) as "\\"
    //  ":" (colon) as "\:"

    sbTags := StringBuilder_Ref.html">chilkat.NewStringBuilder()
    sbValues := StringBuilder_Ref.html">chilkat.NewStringBuilder()

    sbContent := StringBuilder_Ref.html">chilkat.NewStringBuilder()
    n := xml.NumChildren()
    i := 0
    for i < n {
        if i > 0 {
            sbTags.Append(":")
            sbValues.Append(":")
        }

        xml.GetChild2(i)
        sbTags.Append(xml.Tag())

        sbContent.SetString(xml.Content())
        numReplaced := sbContent.Replace("\\","\\\\")
        numReplaced = sbContent.Replace(":","\\:")
        sbValues.AppendSb(sbContent)
        xml.GetParent2()

        i = i + 1
    }

    sbSigningStr := StringBuilder_Ref.html">chilkat.NewStringBuilder()
    sbSigningStr.AppendSb(sbTags)
    sbSigningStr.Append(":")
    sbSigningStr.AppendSb(sbValues)

    crypt := Crypt2_Ref.html">chilkat.NewCrypt2()
    crypt.SetHashAlgorithm("sha256")
    crypt.SetMacAlgorithm("hmac")

    hmacKey := "934D1E806DDD99595EB430076FD7F8E4D12D0A3F51243A4C0C3897703118E739"
    crypt.SetMacKeyEncoded(hmacKey,"hex")

    crypt.SetEncodingMode("base64")
    merchantSig := crypt.MacStringENC(*sbSigningStr.GetAsString())

    fmt.Println(*merchantSig)

    gzip.DisposeGzip()
    xml.DisposeXml()
    sbTags.DisposeStringBuilder()
    sbValues.DisposeStringBuilder()
    sbContent.DisposeStringBuilder()
    sbSigningStr.DisposeStringBuilder()
    crypt.DisposeCrypt2()