# Order

Structure of an order. The structure is used:

when checking an outgoing order by the account script or the verifier function of the dApp script,
in the InvokeScriptTransaction.

# Constructor

Order(id: ByteVector, matcherPublicKey: ByteVector, assetPair: AssetPair, orderType: Buy|Sell, price: Int, amount: Int, timestamp: Int, expiration: Int, matcherFee: Int, matcherFeeAssetId: ByteVector|Unit, sender: Address, senderPublicKey: ByteVector, bodyBytes: ByteVector, proofs: List[ByteVector])

In Standard library verion 8:

Order(id: ByteVector, matcherPublicKey: ByteVector, assetPair: AssetPair, orderType: Buy|Sell, price: Int, amount: Int, timestamp: Int, expiration: Int, matcherFee: Int, matcherFeeAssetId: ByteVector|Unit, sender: Address, senderPublicKey: ByteVector, bodyBytes: ByteVector, attachment: ByteVector, proofs: List[ByteVector])

# Fields

#	Name	Data type	Description
1	id	ByteVector	ID of an order
2	matcherPublicKey	ByteVector	Public key of a matcher
3	assetPair	AssetPair	Pair of tokens
4	orderType	Buy\|Sell	Type of an order — selling or buying
5	price	Int	Price of a token to exchange
6	amount	Int	Number of tokens to exchange
7	timestamp	Int	Unix time of the validation of an order by a matcher
8	expiration	Int	Unix time when an uncompleted order will be canceled
9	matcherFee	Int	Transaction fee
10	matcherFeeAssetId	ByteVector\|Unit	Token of a transaction fee. It can only be WAVES
11	sender	Address	Address of the sender of an order
12	senderPublicKey	ByteVector	Public key of the sender of an order
13	bodyBytes	ByteVector	Array of bytes of an order
14	attachment	ByteVector]	Arbitrary data. The maximum data size is 1024 bytes
15	proofs	List[ByteVector]	Array of proofs

# Example

The script below enables buying from a sender's account:

only the specified asset,
only at a given price,
only for WAVES.

{-# STDLIB_VERSION 8 #-}
{-# CONTENT_TYPE EXPRESSION #-}
{-# SCRIPT_TYPE ACCOUNT #-}

let myAssetId = base58'8LLpj6yQLUu37KUt3rVo1S69j2gWMbgbM6qqgt2ac1Vb'

match tx {
   case o: Order =>
        let isWavesPriceAsset = !isDefined(o.assetPair.priceAsset)
        let rightPair = (o.assetPair.amountAsset == myAssetId) && isWavesPriceAsset
        sigVerify(o.bodyBytes, o.proofs[0], o.senderPublicKey)
        && rightPair
        && o.price == 500000
        && o.orderType == Buy
   case _ => false
}