Get a Release Letter: Once all obligations are fulfilled, ask for a release letter from the factoring company. This document should state that you have fulfilled all contractual obligations and that the factoring company has no further claim on your invoices or receivables.
Invoice factoring is an agreement to assign your accounts receivable (A/R) to a factoring company. So the letter communicates that a third party (factoring company) is managing and collecting your A/R.
Invoice factoring can be a good option for business-to-business companies that need fast access to capital. It can also be a good choice for those who can't qualify for more traditional financing.