How to apply credit to an invoice/quote/ order in Cin7

Here's a more detailed breakdown:

1. Create or Identify a Credit Note: If the customer needs to be credited, you'll first need to create a credit note. This can be done through various methods, such as issuing a credit note for a unit price overcharge or adding a customer credit through a credit note. 
2. Locate the Invoice/Quote/Order: Navigate to the relevant invoice, quote, or order in the Cin7 Core system.
3. Apply the Credit:
4. Allocate Credit Note: If the customer has existing credit notes, you'll likely find a "Allocate Credit Note" option within the payment section of the invoice/quote/order.
   1. Apply Credit: Some systems may use a "Apply Credit" option instead, which allows you to directly apply a credit balance.
      1. Choose the Credit Note(s): A popup window will appear, listing all available credit notes for the customer.
      2. Select the credit note(s) you want to apply.
      3. Choose the Amount: You can choose how much of the credit to apply to the invoice. 
      4. Save: Click "Add" or "Save" to apply the credit to the invoice. 

To create a standalone credit note:

1. Navigate to Sales → New → Sale Credit Note.
   
   

2. Select a Customer from the list.

3. Most of the information will be filled automatically. Check the details and amend any, if necessary.

4. Enter the Credit Note Date and Customer Reference (if applicable).

5. Assign a Sales Representative.

6. Click + or Add more items to add items. Since the credit note is not associated with a sales order, the list of products will not come up but you can select your Refund item from the list of services.

7. Enter the value of the Refund into the Price field.

8. Click Authorize.

Refunds

Refunds are applied to credit notes in the same way that payments are applied to invoices. Credit notes must be authorized before refunds can be applied.

You may wish to use the RMA and returns module to handle returns and refunds of your products - this module enables more complex returns workflows including restock, replacing, repairing, inspecting, and scrapping items, automatically generating the necessary credit notes and refund payments where applicable.

Note: If using Xero as your accounting system, ensure Xero payment settings are set to Synced both ways or Pushed to Xero. QuickBooks Online payments are set by default to sync both ways. Some users prefer to entirely manage their payments/refunds through their accounting system. If this is the case, you can leave this section blank, the refund details will be imported from your accounting system and applied to the order.

Credit notes can be issued as a refund or as a customer credit to be used against future sales.

To issue a credit note refund to a customer credit:

1. Return some or all of the value of the credit note to a customer credit by clicking +Return to Customer Credit.

2. A pop-up window will open, fill in the fields and click Create to continue.

3. The customer credit value will be added to the Refund section.

To issue a credit note refund as payment:

1. Return some or all of the value of the credit note to the customer by clicking + Refund.

2. Enter the details of the account to make the payment from and the date paid, then click Save to finish.