I can't add my credit card on my apple wallet. (indonesia)

Apple Pay is not yet active in Indonesia.

See the list Countries and regions that support Apple Pay - Apple Support

You might be interested in expressing your interest in getting ApplePay in Indonesia - Feedback - Apple Pay - Apple

Apple Pay is not available in Indonesia, see the following Apple articles:

Countries and regions that support Apple Pay

Countries and regions that support Apple Pay - Apple Support (EG)

Negara dan wilayah yang mendukung Apple Pay

Negara dan wilayah yang mendukung Apple Pay - Apple Support (ID)