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For now, you cannot delete multiple paid invoices all at once. You'll have to delete them one at a time.
Here are the steps:
You can receive a payment for multiple invoices for the same customer by creating a Receive Payment transaction.
Let me show you how:
In creating this transaction, the amounts of each selected invoices will be summed up.
However, you'll need to receive invoice payments from multiple customers one customer at a time. You can follow the same steps I've shared above.
Here's an article that you can read on about payment recording: How to Record a Customer Payment?
If you have any other questions, please leave a comment below.