To verify your payment method, Google Play and App Store charges you a temporary authorization charge of 1 USD.

This is a temporary charge and will be removed uppon verification.

For further inquiries related to temporary charges, please contact Google Play/App Store support.

[Google Play Customer Center]
https://support.google.com/googleplay/answer/6224192?hl=en&ref_topic=4774828

[App Store Customer Center]
https://support.apple.com/en-us/HT201292

[Samsung Galaxy Store Customer Center 1:1 inquiry]
https://help.content.samsung.com/csweb/main/main.do