New to quickbooks - We are a pest control company and often customers will make bank payments without invoices being made - how do we record this?

Glad to see you in the Community, usertom6. 

I'm here to provide some options.

If you want to record the payment as a credit for the customer, you can create a bank deposit. 

Here's how:

1. Go to + New > Bank deposit.
2. Choose the bank account from the Account drop-down menu.
3. In the Add funds to this deposit section, add the customer's name from the Received From drop-down list.
4. Select Accounts Receivable from the Account field. 
5. Enter the amount in the Amount field.
6. Click Save and close. 

Once done, go back to the Customer Information page and you will notice an open balance. You can apply the open balance when you create an invoice in the future. Here's a sample screenshot for a visual reference:

On the other hand, if your customer immediately pays for products or services at the time of sale, you can use Sales Receipt. Please feel free to watch the video tutorial in this article: Create and send sales receipts in QuickBooks Online.

If you have more questions related to customers or other concerns, please let me know in the comments below. Have a good day!