Question to USA people

[nihaonihao]

What is the most convient way to pay... Is USA people pay to each other using online transfers?
Im Going to create Some service I just Want to know what is the best way to receive payments...
If it will be uk I know for sure that faster payment are in uk best option.. I wonder If USA have similar service? Maybe in USA will be Some sort of cash vouchers Good? Or Something?
Idee like to hear what members Here Know about this and Know More about USA payments. Systems
Canada I Know the online transfers could be real pain too and very slow and get blocked Even u do legit transfers online
Thanks dudes