Back in September 2020, I was researching open-source architectures - meaning looking at several customer solutions from my employer at the time - and developing a generic view of these solutions for certain use cases.
One of the use cases is known as financial payments. Back in 2020, I kicked off a series covering this architecture with the article Payments Architecture - An Introduction. The series consisted of six articles and covered architectural diagrams from logical and schematic to detailed views of the various use cases we uncovered.