Hey there Alpine walker,
Thanks for reaching out to Apple Support Communities. I understand you’ve been charged twice for a purchase from the Online Apple Store. I’ll be happy to help with this.
If this was a purchase from the Online Apple Store, you’ll want to reach back out to them directly Here’s a link for your convenience:
Contacting Apple
If this was a purchase made from the App Store or iTunes, you can use this link to help you identify why you were billed twice:
If you see apple.com/bill, itunes.com/bill, or an unfamiliar charge on your statement
You can request a refund with the steps here:
Request a refund for apps or content that you bought from Apple
I hope this helps.