To issue an invoice to a client this can be done by going to the POS menu, select Receipts and choose the receipt that you want to issue the invoice.
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Click long on the receipt and select: Email invoice or Print Invoice.

After this, you will need to select the customer for whom you are issuing the invoice.

If the Customer already exists in your Client application, you will need to search for its name and select it from the drop down list.

If you choose to send the invoice via E-mail, you will need to click Yes, to send it.

If you choose to Print the Invoice, you just need to select the client.

If the Customer does not exist, you will need to create it, from the + button.

For creating a new Client in POS please Click Here