Yes, FIServe has a good and fairly extensive API. Connectivity may be a challenge depending on the type of services you have with FIS and how you connect to them now. It may be easier to have a web proxy on your corporate edge that talks to the FIS services internally. You can find their API here:
Payments API | Payments (fiserv.com), but be sure to talk to FIS about what is open to Genesys Cloud and the restrictions around REST-based services with only JSON packets.
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Robert Wakefield-Carl
Avtex Solutions, LLC
Contact Center Innovation Architect
https://www.Avtex.comhttps://RobertWC.Blogspot.com------------------------------