Purchases made in Golf Clash are processed by iTunes. The available payment methods vary by country, but the following payment methods are commonly accepted: 
  • Credit cards
  • iTunes cards
  • iTunes Store gift certificates
  • Content codes
  • Store credit (including Allowance Account balances)
  • ClickandBuy
  • PayEase
  • PayPal
You can find out more information on iTunes accepted forms of payments here:  iTunes Payment Support