The company’s sustained growth stems from its focus on complex payment landscapes. By combining U.S.-based support with an expanding technology stack—ranging from ACH and Pay by Bank to instant funding—FLEX has solidified its role as a specialized partner for industries that often face traditional banking hurdles.
FLEX Payment Solutions Marks Sixth Year on Inc. 5000
St. Louis-based FLEX Payment Solutions has secured its sixth consecutive spot on the Inc. 5000 list, ranking 3,644th nationally and 40th among Missouri private firms. The family-owned provider, which processed over $2.6 billion in volume last year, continues to serve high-regulation sectors including cannabis and tribal enterprises.
President Rob Zeitler credited the achievement to the consistent dedication of his team and the trust placed in them by clients navigating evolving financial requirements. As the firm scales, it is reinvesting into new product lines designed to simplify payment management for businesses operating in sectors like consumer finance and hemp. These ongoing developments aim to provide more secure, reliable infrastructure for merchants handling sensitive or highly regulated transactions.
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