The smartphone as a method of payment has been successfully introduced in several European countries, experiencing significant user and usage growth over the last years. Thirteen leading mobile payment providers combining millions of users agree to foster collaboration and international payment through an association, which was founded in Zurich, Switzerland. EMPSA covers Belgium (Bancontact Payconiq), Germany and Austria (Bluecode), Denmark and Finland (MobilePay), Portugal (SIBS/MB WAY), Spain (Bizum), Sweden (Swish), Switzerland (TWINT), Norway (VIPPS), Italy (BANCOMAT), Poland (BLIK), Bulgaria (BORICA), the Netherlands (iDEAL), and Greece (DIAS S.A.). More countries and mobile payment systems are expected to join the association soon.