For Php

Variable	Description
$parameter	Body request parameter array
$key	get it from api panel
$iv	get it from api panel

public static function encrypt($parameter, $key, $iv)
{
  $data = json_encode($data, JSON_UNESCAPED_SLASHES);
  $ciphertext_raw = openssl_encrypt($data, "AES-256-CBC", $key, OPENSSL_RAW_DATA, $iv);
  return bin2hex($ciphertext_raw);
}

$encyptedBody = $this->encrypt($parameter, $key, $iv);

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For online reference

Aes Encryption