If you are required to subscribe to continue to score, then you will need to login to your app store account
(either Apple of Google) after selecting the subscription button within MiScore.
On successful authentication with the App store, you will receive a notice on whether the payment method is validated and subscription was successful or not.
All subscriptions include a two week trial period. At the end of the two week trial, the payment method assigned to your app account will be charged the amount of $16.49 AUD and is set for auto renewal every annual year.
You will need to have some type of payment method or account balance with your app store account (Apple / Google Play)
For more info about buying in-app products from the app stores, please access the links below:
Apple >
https://support.apple.com/en-au/HT202631
Google Play>
https://support.google.com/googleplay/answer/113409?hl=en
https://support.google.com/googleplay/answer/1061913?hl=en