payInvoice
exports["nass_billing"]:payInvoice(reference, identifier, signature)
Returns true or false if the invoice was able to be paid
createInvoice
exports["nass_billing"]:createInvoice(source, target, reason, description, amount, isBusiness, customAdjustment)
Create an invoice from player IDs
createInvoiceByIdentifier
exports["nass_billing"]:createInvoiceByIdentifier(sender_name, sender_identifier, target_name, target_identifier, reason, description, amount, isBusiness, customAdjustment)
Create an invoice from identifiers
cancelInvoice
exports["nass_billing"]:cancelInvoice(reference)
Cancels an invoice and returns true or false if it was cancelled
