A customer who has paid online in the past through the invoice...Now he says the link is no longer there, Online Payments is turned on... how do i fix...or check?

Hey there, @stevenbwinters. 

I hope you're enjoying this beautiful day. 

I recommend deleting, recreate, and resend the invoice to your customer. There could've been an issue in sending the invoice, which then left a broken thread to the customer, causing the link to pay the invoice not to appear. I've included the steps below to delete, recreate, and resend the invoice. 

1. Locate the invoice. 

2. Select the customer in which the invoice was created, then click the drop-down arrow next to Receive Payment and choose Delete. 

3. Select New invoice to create a new invoice for the customer. 

I also suggest ensuring that the Online Payment button is turned on before sending the invoice. 

Please let me know if you have further questions or concerns. It's my goal to get you back to business every step of the way. You can always reach back out to the Community or me anytime you find you need help. Take care!