GoCoinDotNet (nuget): Any time a customer is paying you in Bitcoin, they will be paying a GoCoin invoice. Each invoice is assigned a single, never used payment address for the cryptocurrency the customer has chosen to pay with.  Invoices that have not been paid are said to be in an 'unpaid' state. An invoice can remain unpaid for 15 minutes. Rather, it has a 15 minute window in which payments are acceptable. This is how GoCoin is able to lock in our 'GoCoin spot rate' (our guaranteed exchange rate) for fiat currencies.
Keywords: gocoin|bitcoin