What happens when a customer cannot pay? October 08, 2019 17:42 If a customer cannot pay an invoice, Thunder Funding will work with you on an individual basis to come up with the most beneficial way to recover the funds. Contact Thunder Funding for more details. Related articles How to find straight box truck loads? How does factoring differ from bank funding? Will I receive a receipt in the mail each month? How do I upload and manage my documents?