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Pillar 01 · Core Authority

Building the Rails

The mechanics of fintech payment infrastructure — payment rail selection, multi-currency ledger design, PayFac models, mobile money integration, remittance corridors, and the architectural decisions that determine whether a fintech actually works at scale or just works in a demo.

10
Topics
1
Active series
1
Framework
0
Published pieces
10 topics · Substack primary · LinkedIn distribution
T-01.01
Why standard Connect models fail in complex multi-corridor environments — and what you actually have to do instead
Substack
T-01.02
Payment rail selection is an architectural decision, not a vendor decision — here's the framework
LinkedIn
T-01.03
The PayFac model explained for founders who are tired of routing through middlemen
Substack
T-01.04
What I learned designing a multi-currency ledger for five markets simultaneously
Substack
T-01.05
Direct API vs. aggregator: the real trade-off most mobile money integrations get wrong
teddoh.io
T-01.06
Why smart payout routing is the most undervalued optimization in fintech infrastructure
LinkedIn
T-01.07
The NFC payment stack in an underserved market: what's different, what breaks, what works
teddoh.io
T-01.08
How I designed BNPL for users with no credit history — the engine behind the decisions
Substack
T-01.09
Remittance corridor design: what cross-border routing actually looks like technically
Substack
T-01.10
The AML/KYC challenge for thin-file users: what compliance means when the user has never had a bank account
Substack
No published pieces yet · This section fills as content ships · Check back after May 27, 2026