Fintech startup Column has achieved a rare technical milestone in the payments industry: building its own payment card issuer processor entirely from scratch. The company now controls the entire stack for issuing and processing credit and debit card transactions, bypassing traditional third-party processors.

What You Need to Know

Column has built an issuer processor from the ground up, a complex undertaking that typically takes years and deep financial systems expertise. The processor handles authorization, clearing, settlement and dispute management. This move allows Column to offer lower costs and faster innovation to its banking and fintech clients. The development signals a shift toward vertical integration in payment infrastructure.

Technical Milestones in Payment Processing

Building an issuer processor requires handling real-time transaction flows, compliance with network rules from Visa and Mastercard, and managing risk at scale. Column engineers designed custom software for each layer of the payment lifecycle. The processor is now live and processing transactions for early customers.

  • Authorization: Real-time risk scoring and network routing for each transaction.
  • Clearing and settlement: Batch processing and fund movement between issuers and acquirers.
  • Dispute management: Automated chargeback handling and compliance with card network rules.

Why This Matters

Column's in-house processor challenges the dominance of established players like Fiserv and First Data. For businesses that issue cards, relying on Column means fewer middlemen and faster feature releases. The move could pressure legacy processors to lower fees or improve API quality. It also demonstrates that a startup can handle a task once reserved for large incumbents, opening the door for more competition in payment infrastructure.

Broader Industry Context

Most fintech companies that issue cards today rely on a handful of processor partners. Those partnerships often limit customization and create dependency risks. Column has chosen the harder path: writing its own code for everything from BIN management to transaction routing. The approach mirrors what Stripe did for online payments a decade ago. If successful, Column could become the backbone for a new generation of card programs.

What Comes Next

Column plans to open the processor to a wider set of clients later this year. The company will need to maintain reliability and compliance while scaling. Early adopters include neobanks and expense management platforms that want more control over their card offerings. Column's long-term bet is that owning the processor will lead to better economics and faster product iteration.