Brian Henry

Add <code>?payment_gateway=preferred_gateway_id</code> to links in emails you send to your customers, and when they reach the 
checkout, that will be the selected payment gateway.
A WordPress filter exists so the text in the URL can be set to whatever you prefer.
<a href="https://github.com/brianhenryie/bh-wc-set-gateway-by-url/" rel="nofollow ugc">Technical detail is on GitHub</a>.

Set WooCommerce Payment Gateway by URL

Set the WooCommerce payment gateway in URLs sent to customers.

joshbuchea

Perform a 301 redirect from an uppercase URL to the lowercase version for all non-admin URLs (that do not include a filename).
Please help by reporting any bugs or feature requests at the link below.
Bugs:
<ul>
<li>Report at: <a href="https://github.com/joshbuchea/wp-force-lowercase-urls/issues" rel="nofollow ugc">Github Issue Tracker</a></li>
</ul>
Questions/Comments:
<ul>
<li>http://joshbuchea.com/</li>
</ul>

WP Force Lowercase URLs

Perform a 301 redirect from an uppercase URL to the lowercase version for all non-admin URLs

Set WooCommerce Payment Gateway by URL vs WP Force Lowercase URLs