![A payment device at a coffee shop in the Union Market district in Washington, USA.](https://imagenes.elpais.com/resizer/v2/RKLGNW436JCX3BDZDRY4G6NO7E.jpg?auth=c669164fb20b03496fef766898fc30ef62a62c80bb3537059fadc9b162f41d8a&width=414&height=233&smart=true)
Tips are baffling Americans
Consumers feel that they are increasingly being asked to pay extra for more services and are unclear when and how much to pay
Consumers feel that they are increasingly being asked to pay extra for more services and are unclear when and how much to pay