Hey there Mansi1,
Thanks for reaching out to us here. It's important that you're able to accept payments from your customers, I can provide some information about payments.
Being able to get payments from your customers is an important step in running your business. If you chose not to go with the Payments feature that QuickBooks offers, there are third party apps that you can chose from within QuickBooks. On the left of your account page, you will see your Tabs, go all the way down and you will see the Apps Tab. In that section you can look for an app that best suits your needs.
If you have any other questions, feel free to reach out here.