Can I please get a refund for the REVER APP charge thank you I got the subscription canceled but it won’t show up in the options to select it to ask for a refund

Cancelling a subscription or deleting an App does not reverse the transaction made.

Unknown Charge?

1. App Purchase
   1. Curious about a Charge? --> If you see an 'itunes.com/bill' or an unfamiliar charge on your statement
   2. If you have an issue with an app on App Store or billing --> Request a refund for an App Store or iTunes Store
2. Subscriptions
   1. You may view a subscription to an app --> See or cancel your subscriptions - Apple Support
   2. You can also request a refund for a recent renewal of an in-app subscription purchase 

Avoid accidental purchases

1. If it is your device then, please --> Use Guided Access with iPhone, iPad, and iPod touch - Apple ... before handing over a device to a child.
2. If it is your child's device then in the future, enable the Ask to Buy feature --> Request and make purchases with Ask to Buy - Apple Support

It could be Phishing

• Beware of --> Phishing & Other Suspicious Emails 
• Know how to --> Identify legitimate emails from the App Store or iTunes Store 
• Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams —> Use these tips to avoid scams and learn what to do if you think your Apple ID has been compromised.

Both apps are not from the App Store, to cancel and refund request you have to arrange with the supplier of those 2 apps yourself, see:  

Rever Help Center

https://help.reverb.com/hc/en-us/articles/360003044354-How-to-issue-a-refund-on-an-order

onX Hunt app how to get a refund

https://onxmapssupport.zendesk.com/hc/en-us/articles/360028499912-How-to-get-a-refund

See also this Apple article: If the subscription that you want to cancel is not listed

If the subscription that you want to cancel is not listed - Apple Support