Temply App

If the invoice has to do with an app that has a subscription associated with it, see -> Delete apps on your iPhone, iPad, and iPod touch -> Delete apps on your iPhone, iPad, and iPod touch - Apple Support

• If you delete an app, it doesn’t cancel in-app subscriptions that you might have. While deleting an app, you might see a Cancel Subscriptions option. Learn how to cancel your subscriptions.

If you don't want to continue a subscription you need always to cancel that subscription in time, see the following Apple articles:

If you want to cancel a subscription from Apple

If you want to cancel a subscription from Apple - Apple Support

If the subscription that you want to cancel is not listed

If the subscription that you want to cancel is not listed – Apple Support (UK)

If you are talking about this app, see also:

Should you choose to upgrade to a Pro subscription, payment will be charged to your iTunes account at confirmation of purchase.

Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.

Account will be charged for renewal within 24-hours prior to the end of the current period.

You may cancel automatic renewal and manage your subscription by selecting Manage App Subscriptions in your iTunes Account settings and selecting the subscription you want to modify.

Any unused portion of a free trial period, if offered, will be forfeited when you purchase a Pro subscription, where applicable.