When I send and invoice it gets sent to customer as paid??

We'll have to configure your Automation preferences to fix the issue, stm.

QuickBooks Online (QBO) automatically applies credits to customer balances or open invoices when the Automatically apply credits feature is enabled, resulting in customer transactions being sent as Paid. Let's check your Automation preferences and make sure it's set up correctly.

Here's how:

1. Head to the Gear icon ⚙ in your company and choose Account and settings. 
2. Go to the Advanced tab and click the Pencil icon for Automation to see more options. 
3. In the Automatically apply credits section, check if the feature is turned on.
4. Move the slider to the left if you wish to disable the function. 
5. Click Save and Done to apply the changes.
   
   

You'll find in-depth information about the process in this article: Create and apply credit memos or delayed credits in QuickBooks Online. 

Incase you don't want to apply the credit to the invoice, void the payment to unlink it from the sales entry. Here's how:

1. Go to the Sales menu on the left panel and select All Sales. 
2. Look for the payment from the list and click the drop-down arrow under the Action column to select Void.
3. Tap the Void button to confirm the action.
   
   

For tips on when to void a sales entry or issue a refund, click the following link: Void or refund customer payments in QuickBooks Online.

Explore the links below for guidance on managing customer payments and processing refunds:

• Fix a payment applied to the wrong invoice in QuickBooks Online
• Record a customer refund in QuickBooks Online
• Record invoice payments in QuickBooks Online
  
  

Feel free to tag me in your reply for any additional questions about applying the credit memo to your invoices and other QuickBooks-related tasks. We're here to make sure everything is taken care of for you.