What routing actually decides, when multi-acquirer setups pay off, and the questions to ask before you believe an orchestration pitch.

The questions in merchant onboarding are not bureaucracy — they are card network rules, sanctions law and acquirer risk policy. What gets checked and why.

Subscriptions live or die on payment operations: stored credentials, network rules for merchant-initiated transactions, and the retry strategy that halves involuntary churn.

A workable daily reconciliation process: the three-way match, handling fees and disputes, and closing the books without spreadsheet archaeology.

Presentment vs settlement currency, where FX costs actually sit, and how to price internationally without margin surprises.

What happens when a payment request times out? Idempotency keys make retries safe — here is how to use them correctly.

Why webhooks beat polling for payment status, and the five rules — signatures, idempotent handlers, 200-fast, queues, reconciliation — for handling them reliably.

Authorization rate is revenue. The concrete factors that move approval rates — data quality, 3DS, retries, routing — and what to fix first.

How a chargeback actually proceeds, what evidence wins disputes, and the operational habits that keep your ratio low.

What a payment token is, how tokenization works at capture, and why it keeps merchants out of PCI scope for card storage.