Integration guides

Working recipes for the most common shapes of payment integration. Each guide is end-to-end: schema, code, tests, and a runnable sample repo.

What you can expect

Telegram bot top-ups — checkout flow, deep-links back to the bot, webhook → bot reply
SaaS subscriptions — initial charge, scheduled renewals, dunning, prorations
Marketplace split payments — funding instructions, hold/capture, payouts to sellers
In-app purchases — mobile SDKs, Apple/Google Pay, idempotency on retries
Steam / gaming top-ups — order_id correlation, refund on delivery failure
Migration from Stripe — endpoint mapping, key conversion, dual-running pattern

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