The cost of developing a payment gateway is complex and influenced by factors such as the features' complexity, the required customization level, and the integration with other systems. While basic gateways with standard features are more affordable, custom-built solutions with advanced functionality can be a significant investment. Development costs typically range from a few thousand to tens of thousands of dollars. To get a precise estimate and ensure your investment is optimized, it's advisable to consult with a payment gateway development service.