1. Login to CORE.

2. Go to Classic Panel

3. Click on Billing in the top right corner 

4. Click on Customers on the left side 

5. Find the customer 

6. Click the Documents tab 

7. Click Add New Payment 

8. Enter your reference number and click the magnifying glass beside the payment method and select Check/Cash

9. Change the Document date to the date the payment was collected 

10. Tick the box beside the invoice/s that have been paid 

11. Check all the details are correct and release the payment. It should then go to Closed status