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uses a Hash Message Authentication Code (HMAC) to check the authenticity of your payments. The MAC HMAC SHA-256 algorithm is used with a 32-digit key length (256 bits) for this. The additional password makes the HMAC procedure particularly safe.
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, which supplies you with the Hash password. |
2 | The HMAC value is calculated with the aid of the password and several parameter values. For the calculation, the parameters PayID, TransID, MerchantID, Amount and Currency are used and separated with asterisks: PayID*TransID*MerchantID*Amount*Currency
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| PayId | Referenced PayId | May be empty, e.g. for creating an initial payment process or risk management request; is used with subsequent requests like capture/refund. | | TransId | Your transactionId to reference / identify your request | Your own reference to identify each request / payment process. | | MerchantId | Your MerchantId assigned to you by | Multiexcerpt include |
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| Your MerchantId identifiying this request. | | Amount | Amount in smallest unit of currency, e.g. 123=1,23 | Amount of this request; may be empty if not used, e.g. for status inquiries. | | Currency | Currency of payment process in ISO 4217, e.g. EUR, USD, GBP | Currency of this request; may be empty if not used, e.g. for status inquiries. | | YourHmacPasswort | Your HMAC-password assigned to you by | Multiexcerpt include |
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| Your MACHMAC-password assigned to a specific MID; if you have different MIDs you will have different MAC HMAC passwords, too. |
Notice: If a transaction does not support all of these parameters, you can simply omit the missing value. For example, there is no PayID yet with the first transaction, so you do not have to transfer this. The PayID is a component of the Hash calculation in subsequent transactions: | Samples for MAC calculation | Formula | Result |
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| without PayId, with amount/currency | sha256HmacSHA256("*TID-4453732122167114558*yourMerchantId*1234*EUR", "mySecret") | 38CED807E293FC634A6C36FFAEA7BD2687038D40615781918AEF2DE7BB9A9903 | | without PayId, without TransId, with amount/currency | sha256HmacSHA256("**yourMerchantId*1234*EUR", "mySecret") | ECBCAB7361CFFE1694D2E893280AED0FEEC2FCF518A736009D38CBD65F0DC68B | | with PayId, without amount/currency | sha256HmacSHA256("fe3f002e19814eea8aa733ec4fdacafe*TID-4453732122167114558*yourMerchantId**", "mySecret") | 5A3ED13E4BF3492166E8E9B5898F372735B6FDCBFFC41B2AB4574A9A6FC9B734 |
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3 | Use the MAC HMAC SHA-256 algorithm, which nearly all programming languages support, in order to calculate the Hash value with the password and the parameter values. |
4 | Use the MAC parameter to transfer the hexadecimal encoded Hash value to the | Multiexcerpt include |
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with each transaction in the encoded data field. |
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