Yes. Otherwise, you don't get any revenue. You can get it by signing up for Amazon Associates.
For the category and tag unit types, no, you don't need them. However, for the search unit type, you need them as the plugin uses Amazon API.
To use the keys you need to have an account with Amazon Product Advertising API. The keys can be obtained by logging in to Amazon Web Services and you need to get Access Key ID (public key) and Secret Access Key (private key).
More detailed instruction, refer to the How to Obtain Access Key and Secret Key section.
With the pro version, unlimited numbers of units can be created. Also the number of categories per unit, the number of items to display per unit are unrestriceted as well. Please consider upgrading it. Amazon Auto Links Pro As of Pro 2.0.6, links can be displayed in multiple columns.
It could be the allocated memory capacity for PHP reached the limit. One way to increase it is to add the following code in your wp-config.php or functions.php
define( 'WP_MEMORY_LIMIT', '128M' );
The part, 128M, should be changed accordingly.
Yes, with Pro!
Post it in the support section. If it is feasible, it will be included in the to-do list in the Other Notes section.
Amazon Auto Links ->
Manage Auto-insert. There turn off unnecessary auto-insert items. You can edit their definitions and define where units should be displayed.
Try Scratchpad to make sure your keys work there as well.
Requires: 3.3 or higher
Compatible up to: 4.2.2
Last Updated: 2015-4-25
Active Installs: 5,000+
0 of 3 support threads in the last two months have been resolved.
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