Hi Prawit,

I am Vincent here.
After purchase the extension, you can download the source code of this extension.
About the license pricing, let me explain to you: We provide 2 types of payment:

** Auto-renewal: You will pay a fixed amount first (239.68$) for the payment to get support, download and upgrade within 6 months. After 6 months, you just need to pay a small fee (for every 6 months) 29.88$ to extend more 6 months of support, download and upgrade ( called renewal fee).

Of course, if you do not like to pay the renewal fee, you can cancel it at any time. In this case (if you cancel it), you still can use our product for a lifetime but without our support, download and upgrade.

** Standard Payment: This is a one-time payment $256.46. You’ll pay one fixed payment to get our product. You also get our get support, download and upgrade within 6 months. After 6 months, if you want to extend your support, download, and upgrade, you have to pay 55% of the first price to renew your support, download and upgrade.

In case, you do not renew it, you still use our product for a lifetime but without our support, download and upgrade.

Based on my experience, you should choose the auto-renewal because you can renewal product at very low fee to get all of the benefits like support, or updates.

(In this technology time, the product should be expected to update continuously, use this to get the latest version if we update our product)

Should you have any questions, feel free to let me know

Regards,
Vincent
Skype: live:vincent_4281
Whatsapp: +84 868 901 261