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var productId = 19038853
var expectedPrice = 20
var expectedSellerId = 38713948
var userassetId = 2

 var buy = 'http://www.roblox.com/API/Item.ashx?rqtype=purchase&productID=' + productId + '&expectedCurrency=1&expectedPrice=' + expectedPrice + '&expectedSellerId=' + expectedSellerId + '&userAssetID=' + userassetId

$.post(buy)

Error: it logs a error page