digital signature for BAB integration

digital signature for BAB integration

 first create sign function and pass the private key and the passphrase if needed
 public function sign(string $data): string
    {
        $privateKey = openssl_pkey_get_private($the_private_key_file,$passphrase_if_needed);
        if (!$privateKey) {
            throw new Exception("Failed to load private key : " . openssl_error_string());
        }

        // sign data using the private key with SHA256 algorithm
        $encryptedData = "";
        openssl_sign($data, $encryptedData, $privateKey, "sha256WithRSAEncryption");

        // Return the signed data
        return base64_encode($encryptedData);
    }
        $path = "/v1/transfer/local";
        $timestamp='';
        $client_secret=config('payment.BAB.client_secret');
        $encoded_payload=json_encode($payload);
        $data="{$client_secret},{$timestamp},{$path},,{$encoded_payload}";
        return  sign($data);