Payment methods are as follows.

[Google Play]
1. International credit cards and debit(check) cards
2. Mobile carrier payment
3. Google Play balance and Google Play Gift cards
4. PAYCO
5. Kakao Pay

Please go to the following link for details about Google Play payment methods:
https://support.google.com/googleplay/answer/2651410?hl=en&ref_topic=3365267

[Galaxy Apps]
1. Samsung Pay
2. International credit or debit card
3. Galaxy Apps gift card
4. Mobile carrier billing
5. Cutureland Gift Card

[App Store]
1. International credit cards and debit(check) cards
2. Kakao Pay
3. Mobile carrier billing
4. PAYCO

Please go to the following link for details about App Store payment methods:
https://support.apple.com/en-us/HT202631