Sometimes it is needed because it helps both the customer and the seller to keep track of what is going on - especially for the seller to keep track of sales and inventory.
An invoice or bill is a commercial document issued by a seller to the buyer, indicating the products, quantities, and agreed prices for products or services the seller has provided the buyer. An invoice indicates the buyer must pay the seller, according to the payment terms.
yes ofcoruse it is needed because it the proof of a commitment,deal between the buyer and seller..
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