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Adyen HMAC Signature Calculation for Hosted Payment Pages

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Demonstrates how to do the HMAC Signature Calculation for a hosted payment page (HPP) in Adyen.

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

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Dim success As Boolean
success = False

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

Dim strHtml As String
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>"

Dim gzip As New Chilkat.Gzip
Dim gzOrderData As String
gzOrderData = gzip.CompressStringENC(strHtml,"utf-8","base64")

Dim xml As New Chilkat.Xml
xml.Tag = "keyValuePairs"

xml.NewChild2 "orderData",gzOrderData

// required, The payment deadline; the payment needs to occur within the specified time value.
Dim sessionValidity As String
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.
Dim countryCode As String
countryCode = "GB"
xml.NewChild2 "countryCode",countryCode

// optional
Dim shopperLocale As String
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.
Dim merchantReference As String
merchantReference = "paymentTest1234"
xml.NewChild2 "merchantReference",merchantReference

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

// required.  10000 for $100.00
Dim paymentAmount As String
paymentAmount = "10000"
xml.NewChild2 "paymentAmount",paymentAmount

// required, The three-character ISO currency code
Dim currencyCode As String
currencyCode = "GBP"
xml.NewChild2 "currencyCode",currencyCode

// required.
Dim skinCode As String
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.  
Dim shopperReference As String
shopperReference = "somebody@example.com"
xml.NewChild2 "shopperReference",shopperReference

// optional
Dim shopperEmail As String
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.
Dim shipBeforeDate As String
shipBeforeDate = "2019-06-04"
xml.NewChild2 "shipBeforeDate",shipBeforeDate

xml.SortByTag True

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

Dim sbTags As New Chilkat.StringBuilder
Dim sbValues As New Chilkat.StringBuilder

Dim sbContent As New Chilkat.StringBuilder
Dim n As Int32
n = xml.NumChildren
Dim i As Int32
i = 0
While i < n
    If (i > 0) Then
        success = sbTags.Append(":")
        success = sbValues.Append(":")
    End If

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

    success = sbContent.SetString(xml.Content)
    Dim numReplaced As Int32
    numReplaced = sbContent.Replace("\","\\")
    numReplaced = sbContent.Replace(":","\:")
    success = sbValues.AppendSb(sbContent)
    success = xml.GetParent2()

    i = i + 1
Wend

Dim sbSigningStr As New Chilkat.StringBuilder
success = sbSigningStr.AppendSb(sbTags)
success = sbSigningStr.Append(":")
success = sbSigningStr.AppendSb(sbValues)

Dim crypt As New Chilkat.Crypt2
crypt.HashAlgorithm = "sha256"
crypt.MacAlgorithm = "hmac"

Dim hmacKey As String
hmacKey = "934D1E806DDD99595EB430076FD7F8E4D12D0A3F51243A4C0C3897703118E739"
success = crypt.SetMacKeyEncoded(hmacKey,"hex")

crypt.EncodingMode = "base64"
Dim merchantSig As String
merchantSig = crypt.MacStringENC(sbSigningStr.GetAsString())

System.DebugLog(merchantSig)