Stripe

Stripe has become the default payment infrastructure for agencies that build digital products, whether for themselves or their clients. Its developer-first approach means agencies can integrate payments into websites, apps, and platforms with minimal friction. The APIs are exceptionally well-documented, which reduces implementation time and lets development teams focus on the product rather than wrestling with payment logic.

For agencies running their own billing, Stripe's subscription engine handles the complexity of recurring payments, proration, and dunning management out of the box. Many agencies use Stripe Billing to charge retainer fees, send one-off invoices for project work, or manage tiered pricing for productized services. The dashboard provides clear revenue reporting, and tools like Revenue Recognition help agencies that need accrual accounting stay compliant without spreadsheet gymnastics.

Compared to PayPal or traditional merchant accounts, Stripe offers far more flexibility and a modern developer experience. The trade-off is that Stripe is transaction-fee based, so high-volume agencies may find costs creeping up. Some agencies have also reported account holds during rapid growth periods, so maintaining clean documentation and gradual scaling is advisable. For any agency with a technical team, though, Stripe remains the gold standard for payment processing.