Multiple online payment gateways can increase the success rate of transaction processing by offering alternatives to customers. If one of your payment gateways is experiencing a low success rate or downtime, an alternative is available. Different gateways support different payment methods and currencies, so having multiple gateways fits into a global strategy. In addition, some customers will simply prefer one gateway over another, such as if they already have an account set up there (e.g., PayPal, Google Pay).