Widely used payment methods other than Paypal?

I am looking for payment methods with which my clients can pay the money for their orders, but I can not use Paypal.
So, I want to know what payment methods are widely used all over the world and what can I use? Bitcoin, WebMonye, ​​PerfectMoney, …? that is, can anyone of you access Bitcoin easily and pay your hypothetical order?

I appreciate your help and response.