You can accept payments in any imaginable way with the payment systems, software, and hardware you already use.
To get started, you will find documentation on the Settle for developers website.
If making technical integrations is outside your business core, many companies specialize in this type of work.
If there is an issue with the Settle app (app not working properly, problems with using cards or internal Settle account, errors related to successfully completing your payment), please contact Settle support. In all other situations, contact your POS or Fiscal register provider.