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95function buy(uint256 _consignmentId, uint256 _amount)
96external
97override
98payable
99onlyAudienceMember(_consignmentId)
100{
101    // Get Market Handler Storage slot
102    MarketHandlerLib.MarketHandlerStorage storage mhs = MarketHandlerLib.marketHandlerStorage();
103
104    // Get the consignment
105    Consignment memory consignment = getMarketController().getConsignment(_consignmentId);
106
107    // Make sure the sale exists
108    Sale storage sale = mhs.sales[_consignmentId];
109    require(sale.start != 0, "Sale does not exist");
110
111    // Make sure we can accept the buy order
112    require(block.timestamp >= sale.start, "Sale hasn't started");
113    require(!AddressUpgradeable.isContract(msg.sender), "Contracts may not buy");
114    require(_amount <= sale.perTxCap, "Per transaction limit for this sale exceeded");
115    require(msg.value == sale.price * _amount, "Payment does not cover order price");
116
117    // If this was the first successful purchase...
118    if (sale.state == State.Pending) {
119
120        // First buy updates sale state to Running
121        sale.state = State.Running;
122
123        // Notify listeners of state change
124        emit SaleStarted(_consignmentId);
125
126    }
127
128    // Determine if consignment is physical
129    address nft = getMarketController().getNft();
130    if (nft == consignment.tokenAddress && ISeenHausNFT(nft).isPhysical(consignment.tokenId)) {
131
132        // Issue an escrow ticket to the buyer
133        address escrowTicketer = getMarketController().getEscrowTicketer(_consignmentId);
134        IEscrowTicketer(escrowTicketer).issueTicket(_consignmentId, _amount, payable(msg.sender));
135
136    } else {
137
138        // Release the purchased amount of the consigned token supply to buyer
139        getMarketController().releaseConsignment(_consignmentId, _amount, msg.sender);
140
141    }
142
143    uint256 pendingPayoutValue = consignment.pendingPayout + msg.value;
144    getMarketController().setConsignmentPendingPayout(consignment.id, pendingPayoutValue);
145
146    // Announce the purchase
147    emit Purchase(consignment.id, msg.sender, _amount, msg.value);
148
149    // Track the sale info against the token itself
150    emit TokenHistoryTracker(consignment.tokenAddress, consignment.tokenId, msg.sender, msg.value, _amount, consignment.id);
151}