Fulvio Notarstefano

WP Currencies uses <a href="http://www.openexchangerates.org/" rel="nofollow ugc">openexchangerates.org</a> to pull currency data and currency exchange rates in WordPress.
The currencies and their exchange rates will be periodically updated at intervals set from the WordPress dashboard by an administrator.
The plugin is intended for developers that want to access currencies data and currency exchange rates from within WordPress and perform basic currency rates conversions. WP Currencies comes with a functions library to retrieve currency data and exchange rates as PHP arrays or json objects in ajax calls.
Furthermore, it extends <a href="https://wordpress.org/plugins/json-rest-api/" rel="ugc">JSON REST WP API</a> with new routes, and, if you use <a href="https://wordpress.org/plugins/advanced-custom-fields/" rel="ugc">Advanced Custom Fields</a> (ACF), WP Currencies will also add a new “Currency” field for use in ACF.
If you use <a href="http://wpml.org/" rel="nofollow ugc">WPML</a> and have both <a href="https://wordpress.org/plugins/woocommerce/" rel="ugc">WooCommerce</a> and <a href="https://wordpress.org/plugins/woocommerce-multilingual/" rel="ugc">WooCommerce MultiLingual</a> installed, you can use this plugin to filter WCML currency rate using <a href="https://wpml.org/documentation/related-projects/woocommerce-multilingual/multi-currency-support-woocommerce/" rel="nofollow ugc">one of their hooks</a> and update rates on the fly.
Important – You will need an API key from http://www.openexchangerates.org/ to pull currency data and make this plugin work properly (either choose the forever free plan or one of their premium subscriptions).
<h4>Documentation</h4>
A more complete documentation for this plugin is found in the <a href="https://github.com/nekojira/wp-currencies/wiki" rel="nofollow ugc">Github wiki</a>.
<h4>Contributing</h4>
To contribute with bug reports or submit pull requests, please refer to <a href="https://github.com/nekojira/wp-currencies" rel="nofollow ugc">WP Currencies repository on Github</a>, thank you.
<h3>Functions</h3>
For the full documentation, please refer to the <a href="https://github.com/nekojira/wp-currencies/wiki" rel="nofollow ugc">WP Currencies wiki on Github</a>.

WP Currencies

Currency data and updated currency exchange rates for WordPress.

GalalAly

Still a beta version.
A WordPress and WooCommerce plugin/extension that allows users to add their own currencies.
You can also define conversion rates for your custom currency (if it is not supported by PayPal) to use PayPal gateway through another supported currency like USD or GBP.
The officially supported gateway for conversions is the PayPal gateway that comes with WooCommerce by default.
Refunds are not yet supported.
New version supports only WordPress 4.0 and WooCommerce 2.2

WooCommerce Custom Currencies

Add your currency to list of supported currencies in WooCommerce

WP Currencies vs WooCommerce Custom Currencies