<?php $merchant = 'VB-USA'; $secretKey = '6c5e27ca-fe94-4e2d-a940-ac7ba4fedd49'; $data = \json_encode(['order_id' => 1000001067]); echo base64_encode( hash_hmac('sha512', $merchant . $data . $merchant, $secretKey) ); // NDg3OGU3MmRiZDM1YjRlMTRjNDRjNDdjMjcwNjAxYmE1OTc2NjViMmFlNjhlOTFjZTBmOTUyMDBkMDRlOTFjMTM1YWU4MzQ0ODUzODYwOTZhYjRhMWNiMzI0NTE5MTQzMDlmZmFiMzNjYmU4OThjODg3NDI1ZDE2MWEzNjRhZGU=
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