There are no other payment processors.
There are no other payment processors that can replace Visa/Mastercard*.
There are other payment processors in India/Japan/China/Brazil/etc. But none of them is internationally adopted like Visa/Mastercard.
In some countries there are other systems. It's high time the modern world adopted something similar like Pix in Brazil.
There are national issuers like JCB or UnionPay.
There are no other payment processors that can replace Visa/Mastercard*.
There are other payment processors in India/Japan/China/Brazil/etc. But none of them is internationally adopted like Visa/Mastercard.