I have an unpaid order pending, how to cancel this?

1.

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)

2.

I have a unpaid order pending on my apple billing.

there's no money on my visa card at the moment.

It is pending because there is no amount on your card.

If you don't do anything, you might be unable to make purchases, download free apps, or use subscriptions. To fix the issue, change your payment method. If you can't change your payment method, you can redeem a gift card and use the balance to pay for any unpaid orders.

That means you will get this message.

3.

See also Ultimate Guitar Subscription information:

• The Ultimate Guitar One subscription gives you unlimited access to the app's premium content and features

• The subscription price is $9.99/monthly, $59.99/yearly*

• Payment will be charged to 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 at the cost of the chosen package

• Subscriptions may be managed, and auto-renewal may be turned off by going to your device's Account Settings after purchase

• There is no way to cancel your current subscription during its active period

• Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable.