Paid Resources

Are you asking how to install an add-on? Most come with install instructions, but the basics is upload the files to library/ and install the XML via the ACP. Or are you asking how to offer paid resources?
 
Make sure you allow Paid resources to be listed in your resource manager via the Usergroup permissions (I believe, if not its in options). After that, create a resource that can be purchased via an External URL.
 
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