Amazon has cemented itself as a top tier option for charging users thanks to its Amazon Flexible Payments Service API. The crowd-funding site Kickstarter has run hundreds of millions through the API, so it should also get some credit. Although, at Amazon, Kickstarter may get blame instead, having inspired many other sites, which eventually caused Amazon to turn away sites with similar concepts.
TrueLayer has introduced a PSD2-compliant Payments API. The API enables transfer of funds directly from bank account to bank account. It uses active authentication for the highest possible security, and transferred funds are received instantly. The API is currently in beta testing.
Banking apps, and their ecosystems, offer banks a multitude of new revenues streams, as well as help to broaden partner and user bases. For those less convinced of app viability, a cursory glance at market trends should be convincing enough