When purchasing a Clipchamp subscription from the Clipchamp app, you will only be able to purchase from the region in which you are currently located. For example, if you are located in the United States, you can only purchase a subscription from the US store.
If you would like to purchase Clipchamp from a different store region, for example because you want to use a credit card from another country, you will have to purchase from the Microsoft store directly using this link.
From the Microsoft store, you can change the region from the link at the bottom of the page:
Using a Virtual Private Network (VPN)
Please note that if you're using a VPN with Clipchamp, it will affect the default region used when making an in-app purchase. If you have any problems purchasing a subscription from within the app because of the region while you are using a VPN, try purchasing it with the VPN disabled.