If you are looking to upgrade from a monthly plan to an annual subscription, simply follow the steps below:
Cancel your existing monthly subscription renewal via Google Play-Store or Apple App-Store;
Wait for the current subscription to end;
Once the period ends, you can then re-subscribe to WeMoney Pro under the annual plan.
If you are looking to switch from an annual plan to a monthly subscription, simply follow the steps below:
Cancel your existing annual subscription renewal via Google Play-Store or Apple App-Store;
Request a refund for the remaining period of your annual plan;
Once this is done, you can then re-subscribe to WeMoney Pro under the monthly plan.