Double Entry (Accounting) How many entries are needed for 1 business transaction (Ex. balance replenishment)?

Question

Electronic accounting

Good afternoon, tell me, when implementing a double entry, how many transactions need to be generated for operations such as replenishment of the balance and payment for the order? Will 1 transaction external system -> internal system be enough or this chain should be formed like this: external system -> user account -> internal system?

Answer 1

what should be the postings supposed to find out from the accountant