flutter wave_encryption.php

<?php

function encryption($payload)
{
    $key = $this->getkey($this->secretKey);
    return $this->encrypt3Des($payload, $key);
}

function getKey($seckey)
{
    $hashedkey = md5($seckey);
    $hashedkeylast12 = substr($hashedkey, -12);
    $seckeyadjusted = str_replace("FLWSECK-", "", $seckey);
    $seckeyadjustedfirst12 = substr($seckeyadjusted, 0, 12);
    return $seckeyadjustedfirst12 . $hashedkeylast12;
}

function encrypt3Des($data, $key)
{
    $encData = openssl_encrypt($data, 'DES-EDE3', $key, OPENSSL_RAW_DATA);
    return base64_encode($encData);
}