with the contracts using Metamask.</p>
<h3>Fee charge permissions</h3>
<p>Some operations may charge a fee from the message sender. Example of these transactions is marking a product and claiming a token for a marked item. The contracts that charge these fees need your permission, you can pre approve these transfers by calling the <code>approve</code> <a href="https://devery.github.io/deveryjs/EveToken.html">EveToken</a>.</p>
<p>Here's a full example on how to check the current allowance and try to increase