The Problem We Were Actually Solving
Our crypto payment store was designed to enable creators around the world to get paid for their digital work without being held back by traditional payment gateways and their associated fees. We had integrated with the major players, but the more we looked at the data, the more we realized that we were simply passing the costs and risks on to our users. The allocation counts were a testament to this: over 70% of our memory usage was dedicated to the payment processing libraries alone. Our users were being charged exorbitant fees, and our system was taking a beating as a result.
What We Tried First (And Why It Failed)
We had tried to optimize the payment processing libraries themselves, tweaking the code and experimenting with different caching strategies. We even went so far as to implement our own caching layer, but the results were underwhelming. The latency numbers barely budged, and the allocation counts continued to climb. I remember reviewing the profiler output one evening, feeling a sense of déjà vu. We were simply throwing more and more resources at the problem, without ever addressing its root cause: the traditional payment processors themselves.
The Architecture Decision
It was then that I made the decision to abandon the traditional payment processors and build our own custom payment gateway from scratch using Rust. I knew it wouldn't be an easy task, but I was convinced that the benefits would be worth it. We would be able to optimize the payment processing logic to our heart's content, without being constrained by the limitations of third-party libraries. We would also be able to eliminate the fees and risks associated with traditional payment gateways, giving our users a fairer deal.
What The Numbers Said After
The results were nothing short of breathtaking. After a few months of development, our allocation counts had dropped by over 90% and our latency numbers had improved by a factor of 10. The profiler output was now dominated by our own custom payment gateway code, which was able to process transactions with lightning speed and efficiency. Our users were happy, and our system was finally able to scale to meet the demands of our growing user base.
What I Would Do Differently
Looking back, I would probably have done more to anticipate the challenges of building a custom payment gateway from scratch. We underestimated the complexity of the payment processing logic, and we ended up spending far more time and resources on it than we had anticipated. I would also have considered using a more mature payment processing library, such as Stripe or Square, which would have saved us a lot of headaches and hair-pulling. But overall, I'm proud of the decision we made to abandon the traditional payment processors and build our own custom solution. It was a tough road, but it was worth it in the end.
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