# Purchasing NFTs from a Sale

**`purchase_nfts<CURRENCY>(...)`**\
**Purpose**: Allows a buyer to purchase one or multiple NFTs directly from the sale by paying the required currency.

**Key Parameters**:

* `sale`: A mutable reference to the `NFTSale`.
* `payment`: A `Coin<CURRENCY>` containing enough value to cover the purchase.
* `asset_ids`: A vector of the specific NFTs (by asset\_id) the buyer wishes to purchase.
* `collection_cap`: For checking deny list and other constraints.
* `ctx`: The transaction context.

**Process**:

1. Verify `sale.is_active` is true.
2. Check that the buyer is not on the deny list.
3. Validate the payment covers `price_per_nft * number_of_NFTs`.
4. Deduct the NFTs from the sale, transfer them to the buyer, and deposit the payment into the sale’s currency balance.
5. Emit an `NFTPurchased` event and update user balances.

**Use Cases**:

* A collector buys 3 NFTs from a sale, paying the set price in the required currency.
* Automated scripts purchase NFTs in batches if they match investment criteria.


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