Create Invoice and Payments
Create Invoice
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Login to your GstBillBooks(https://gstbillbooks.com/) application account.
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Choose Income -> Invoice on the left side menu.

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Click on the '+' plus button on top right side to create.
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Fill the customer details, date, sale category.

- Add product using Add Item button and you can apply dicounts for each product if you have one.

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Once done click Create and your Invoice is created.
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To record a payment Open the created Invoice and Click Send at the top.

- Once sent you can add payment by click Add Payment button Resend and Send Reminder

Create Revenue
- To create a Revenue payment choose Income -> Revenue on the left side menu.

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Click on the '+' plus button on top right side to create.
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Fill all the fields on the create page. You can also add files or screenshots.

- Once done click Create.
Create Credit Note
- To create a Credit Note choose Income -> Credit Note on the left side menu.

- On the create page choose the Invoice for which Credit needs to be created.

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Choose the date and type the description if you have one.
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Click Create to create the Credit Note.