There are numerous definitions and materials available for payment gateways and how you will incorporate these options into your website for your customers. How to find the right niche? If you need such services for your website, you should have to submit documents proving that your business is legit. In some cases, they won't ask, but in the current business environment, people might worry about internet scams and losing payments from their wallets. You might deal with or find the right resources for your business.