The first successful payment is a poor estimate of how much a Telegram monetization bot will cost to operate. A demo can accept a payment and return an invite link. A working service also needs to explain why a customer was charged, preserve the access they bought, and recover when Telegram or a payment integration fails. The build-or-buy decision is about who will own that work over the next year. This article sets out a decision method, a cost model, and acceptance tests. Product and API re...