Invoices and payment receipts are source documents for accounting; an invoice is also called a bill. Invoices and receipts are used in accounting to record sales transactions and to account for requests and receipts for payment.
A receipt is documentation that payment has been made to finalize a sale. It serves as proof of ownership in most cases. It lists goods or services, prices, credits, discount, taxes, total amount paid and method of payment.
Once payment has been made you'll also need to offer the customer a receipt confirming their payment of goods or services.
Invoices are used to request payment from buyers, keep track of sales, help control inventory and facilitate delivery of goods and services.
Receipts are used by buyers or customers to prove they paid for an item, especially in return situations in which goods are faulty or defective.