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56function purchase(
57    uint256 campaignId,
58    uint256 amountOfFractions,
59    bytes calldata discountOperationData,
60    bytes calldata postPurchaseData,
61    uint32 chainId
62) external payable onlyExternalDelegateCall requireTxDataAuth {
63    IPurchaseStateFacet(address(this)).checkPurchaseState(campaignId);
64    IPurchaseTimeFacet(address(this)).checkPurchaseTimes(campaignId);
65
66    address account = ERC2771RecipientStorage.layout()._msgSender();
67    IPurchaseAmountFacet(address(this)).checkPurchaseAmounts(campaignId, amountOfFractions, account);
68    uint256 discountPercentage = IPurchaseDiscountFacet(address(this)).getDiscount(
69        campaignId,
70        amountOfFractions,
71        account,
72        discountOperationData
73    );
74    IDoPurchaseFacet(address(this)).doPurchase(campaignId, account, amountOfFractions, discountPercentage);
75    if (GeneralStorage.layout().infoForId[campaignId].isMinting) {
76        // Mint to the diamond and then transfers etc will be handled by postPurchase
77        // Always mint id 0 if semi fungible. All other ids are used only for vesting in current version.
78        ISemiFungibleAndFungibleFractionTransferFacet(address(this)).mintFractions(campaignId, address(this), 0, amountOfFractions);
79    }
80    IPostPurchaseFacet(address(this)).handlePostPurchasePhase{value: msg.value}(
81        campaignId,
82        amountOfFractions,
83        chainId,
84        account,
85        postPurchaseData
86    );
87
88    emit FractionsPurchased(campaignId, account, amountOfFractions);
89}