With this PrestaShop module you can sell cd keys / license keys in your online shop. Module allows to import codes in bulk and to add them in bulk too. Addon sends codes automatically right after customer will order the cdkey product and if payment will be accepted.
more informations about this module you can find on official module page here:
You can find there only valuable solutions for your e-commerce shop based on PrestaShop engine. Search the best plugin for your store that will meet your requirements and just use it.