[vivekpreddy]

If you're a startup selling to the enterprise, I would highly encourage billing upfront. Collecting cash upfront has huge ramifications for cash flow and how fast you can grow the business.

In terms of payment, it really depends on the company and size of deal. For some companies you can send an invoice and they'll send you a check back quickly, but the larger enterprises usually will need you to fill out a PO, you'll certainly go through procurement, and then you'll be able to invoice. I've typically seen Net 30 days for payment due date, but some companies may push back to Net60.

Credit Card usually only works for smaller transactions (<$10k) or monthly recurring charges.