To top up, you only need an email address. A code will be sent to your email, write it in the order chat.
X2 on the first top-up, for all platforms.
If you need in-game sets, write in the chat - I will add the necessary ones to the offer.
Additional Information
Arknights (Chinese: 明日方舟; Pinyin: Míngrì Fāngzhōu; lit. "Ark of Tomorrow") is a mobile science fiction tower defense video game developed by Hypergryph for Android and iOS.