createIncomingInvoice()
getIncomingInvoices()
IncomingInvoice subject is an object that has invoices (contact or estimate)
createIncomingInvoice() : \Moneybird\IncomingInvoice
\Moneybird\IncomingInvoice
getIncomingInvoices(\Moneybird\IncomingInvoice_Service $service, string $filter) : \Moneybird\IncomingInvoice_Array
\Moneybird\IncomingInvoice_Service
string
\Moneybird\IncomingInvoice_Array