{"title":"HMAC signature calculation","category":"default","creationDate":1776961627,"content":"
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Hosted Payment Pages are no longer available<\/strong><\/p>\n

To accept payments through an Adyen-hosted page, use our Hosted Checkout<\/a>.<\/p>\n

This page is for the classic Hosted Payment Pages (HPP) integration, which has reached end-of-life. We are no longer processing transactions though HPP.<\/p>\n<\/div><\/div>\n

To ensure authenticity and data integrity of incoming requests Adyen requires these requests to be signed.\u00a0This signature is based on a\u00a0Hash-based Message Authentication Code (HMAC)<\/a>\u00a0calculated using a request's key-value pairs and a secret key, which is known only to you and Adyen.\u00a0<\/p>\n

Before sending a request to Adyen, you calculate a signature and add it as a request parameter. When a request comes in, Adyen calculates the same signature based on the received key-value pairs and the secret key stored by Adyen. By verifying that both signatures are equal, Adyen ensures that the request is not\u00a0tampered.<\/p>\n

Similarly,\u00a0you can validate responses from Adyen by calculating the corresponding signature and comparing it with the signature in the response.<\/p>\n

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Signatures can also be used to\u00a0add an extra layer of security for\u00a0webhooks<\/a>. However, the calculation for this functionality is different. For details, refer to the\u00a0Signing webhooks with HMAC<\/a>\u00a0guide.<\/p>\n<\/div><\/div>\n

Getting HMAC keys<\/h2>\n

You need to generate your secret HMAC keys to use them for signature calculation. To obtain these keys for the test and live platform, follow the steps below:<\/p>\n

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  1. \n

    Log in to your\u00a0Customer Area<\/a>\u00a0using your company account.<\/p>\n<\/li>\n

  2. \n

    From the main menu, select\u00a0Account<\/strong>\u00a0>\u00a0Skins<\/strong>.<\/p>\n<\/li>\n

  3. \n

    Select an existing skin from the\u00a0List<\/strong>\u00a0tab or create a new skin by switching to the\u00a0New<\/strong>\u00a0tab.<\/p>\n<\/li>\n

  4. \n

    Click\u00a0Generate new HMAC key<\/strong>\u00a0both for the\u00a0Test platform<\/strong>\u00a0and\u00a0Live platform<\/strong>. Then copy new keys and store them in a secure place in your system to access these values later.
    \n\"Generate<\/p>\n<\/li>\n

  5. \n

    Provide a description for this skin.<\/p>\n<\/li>\n

  6. \n

    To save the skin click\u00a0Create New Skin on Test<\/strong>\u00a0at the page bottom.<\/p>\n<\/li>\n<\/ol>\n

    Implementing signature calculation<\/h2>\n

    In this tutorial, we use the following HMAC key and key-value pairs as an example.<\/p>\n

    Sample HMAC key:<\/p>\n

    44782DEF547AAA06C910C43932B1EB0C71FC68D9D0C057550C48EC2ACF6BA056<\/code><\/pre>\n
    Sample key-value pairs:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
    Key<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    shopperLocale<\/td>\nen_GB<\/td>\n<\/tr>\n
    merchantReference<\/td>\npaymentTest:143522\\64\\39255<\/td>\n<\/tr>\n
    merchantAccount<\/td>\nYOUR_MERCHANT_ACCOUNT<\/td>\n<\/tr>\n
    sessionValidity<\/td>\n2018-07-25T10:31:06Z<\/td>\n<\/tr>\n
    shipBeforeDate<\/td>\n2018-07-30<\/td>\n<\/tr>\n
    paymentAmount<\/td>\n1995<\/td>\n<\/tr>\n
    currencyCode<\/td>\nEUR<\/td>\n<\/tr>\n
    skinCode<\/td>\nX7hsNDWp<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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    Do not use this example key for your real integration with Adyen.<\/p>\n<\/div><\/div>\n
    \n    <\/code-sample>\n<\/div>\n
    1.\u00a0Sort the key-value pairs by key.<\/p>\n
    \n    <\/code-sample>\n<\/div>\n
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    1. Replace null values with an empty string (\"\") and escape the following characters in the value of each pair:<\/li>\n<\/ol>\n