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<?php $post_parameters = array('type' => 'buy', 'amount' => 5.3); $concatted_post_parameters = ''; $http_method = 'METHOD'; $uri = 'API'; $api_key = '789'; $nonce = 555; $secret = '123'; ksort($post_parameters); // Sort parameters by key ascending if (0 < count($post_parameters)) { // Generate URL-encoded query string $concatted_post_parameters = http_build_query($post_parameters, '', '&'); } $hmac_data = implode('#', array($http_method, $uri, $api_key, $nonce, md5($concatted_post_parameters))); $hmac = hash_hmac('sha256', $hmac_data, $secret); print($hmac_data);

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