Added: Caching submodule for fast loading of wallet transaction page.
Added: Wallet gateway as a submodule to generalize the codebase.
Added: Resend OTP feature after its expired.
Added: Wallet notification for each wallet transaction like cashback, recharge, transfer and manual transactions.
Fixed: Coding standard according to WordPress and WooCommerce Coding standard.
Fixed: Issues in cachback calculation and its transfer.
Fixed: Issue in sorting cachback rules table in admin dashboard.
Fixed: Issue in exporting the filter transactions from admin list.
Fixed: Issue in updating wallet recharge price in cart when multiple user recharging the wallet simultaneously.
