My customer can't make a payment.

A few simple solutions to try if your customer isn't able to make a payment.

Make sure that you have given that company or customer permission to make payments. Select the company that you would like to receive payment from, select Info, scroll down to Company Permissions and make sure Make Payments has been selected. This should automatically allow all contacts associated with that company to also make payments.

Check your customer's credit limit and make sure they have not exceeded it or would exceed it with this order.