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With which premium sms services does the plugin currently work with?

It works with every service which provides you with a set of codes and lets you check user input against them by yourself.

I tested it with:

• https://www.mobilepay.pl/ (pack)

How many files can I sell at the same time through this plugin?

Currently, the plugin supports selling only one file at any given time. Therefore, it's only good for people who have one ebook or program to sell on one blog.

Does my package file have to be of a certain type?

No, it can be of any type (pdf, exe, zip, doc, etc.). But it is a good idea to compress it, because there are limits to the size of email messages (often a message must be less than 10MiB).

Can I add my own codes to give away to my readers?

Yes, you can add your own custom (promotional) codes.

Can you add support for remote validation of codes?

I will add support for remote validation in future versions. You can help by sending me links to technical data of your service provider.

Which languages are supported?

Currently:

• English
• Polish (pl_PL)

This plugin is gettext-ready. You can easily translate it into your language.