Payments
XRP Ledger payments: fees, escrow, checks and channels
Sending value is the ledger's original job. These pages follow a payment from the signed transaction to the validated result, and the features built around it.
Fees and escrow look unrelated, but both come down to the same thing: the sender decides a field at signing time, and the ledger will not fix it afterward. Read the fee page before the escrow page.