Will the notification be sent after buying $7000 dollars in an app

I don't understand what you did. Do you think you could have been scammed?

Did you provide any potentially damaging information to anyone? If yes, you'll need to follow up, for example, with a credit card company, Apple, your bank, etc.

If you gave you Apple ID password to a scammer, then

Change your Apple ID password https://support.apple.com/en-us/HT201355

Here is What to do [before] or after you change your Apple ID or password https://support.apple.com/en-us/HT204071

See If you think your Apple ID has been compromised https://support.apple.com/en-us/HT204145 to see what to do.

Increase the Security of your Apple ID https://support.apple.com/en-us/HT201303

iCloud security overview  https://support.apple.com/en-us/HT202303

Ways to keep your information safe on Mac https://support.apple.com/en-gb/guide/mac-help/mh11402/mac

FYI: 

 See If you see apple.com/bill, itunes.com/bill, or an unfamiliar charge on your statement https://support.apple.com/en-us/HT201382

See Identify legitimate emails from the App Store or iTunes Store https://support.apple.com/en-us/HT201679

For scam related information from Apple including reporting scams to Apple see Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams https://support.apple.com/en-us/HT204759

Great. I don't expect to be notified by my credit card companies until I get my statements. You should be able to get the information you want online I would think by signing into your credit card account.

If you want to be notified when a purchase is made, you need to set that up on the credit card company's website.

You are welcome.