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<?php $paramList = array(); $paramList['Shop_IDP'] = '1111111'; $paramList['Order_IDP'] = 125; $paramList['Subtotal_P'] = sprintf('%.2f', (float)235.69); $paramList['Parent_Order_IDP'] = 125; $signaturePart = implode('&', array_map(function($param){return md5($param);}, $paramList)); echo $signaturePart;

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