I've been using a great marketplace recently because of the exact same payment issues. You can easily do your clash royale store there for Pass Royale or gems without any issues. The pricing is usually cheaper than the in-game shop, and the resources show up on your account within minutes via Player ID. Just make sure your tag is correct before buying.
Educate. Empower. Act. The mission of Project WET is to reach children, parents, educators and communities of the world with water education.
