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38function purchase(
39    uint256 campaignId,
40    uint256 amountOfFractions,
41    bytes calldata discountOperationData,
42    bytes calldata postPurchaseData,
43    uint32 chainId
44) external payable onlyExternalDelegateCall {
45    IPurchaseStateFacet(address(this)).checkPurchaseState(campaignId);
46    IPurchaseTimeFacet(address(this)).checkPurchaseTimes(campaignId);
47
48    address account = ERC2771RecipientStorage.layout()._msgSender();
49    IPurchaseEligibilityFacet(address(this)).checkPurchaserEligibility(campaignId, account, amountOfFractions);
50    IPurchaseAmountFacet(address(this)).checkPurchaseAmounts(campaignId, amountOfFractions, account);
51    uint256 discountPercentage = IPurchaseDiscountFacet(address(this)).getDiscount(
52        campaignId,
53        amountOfFractions,
54        account,
55        discountOperationData
56    );
57    IDoPurchaseFacet(address(this)).doPurchase(campaignId, account, amountOfFractions, discountPercentage);
58    if (GeneralStorage.layout().infoForId[campaignId].isMinting) {
59        // Mint to the diamond and then transfers etc will be handled by postPurchase
60        // Always mint id 0 if semi fungible. All other ids are used only for vesting in current version.
61        ISemiFungibleAndFungibleFractionTransferFacet(address(this)).mintFractions(campaignId, address(this), 0, amountOfFractions);
62    }
63    IPostPurchaseFacet(address(this)).handlePostPurchasePhase{value: msg.value}(
64        campaignId,
65        amountOfFractions,
66        chainId,
67        account,
68        postPurchaseData
69    );
70
71    emit FractionsPurchased(campaignId, account, amountOfFractions);
72}