"requests" : {
    "-KpPjt5jQZHBalQRxKSK" : {
      "email" : "pariksheet@agsft.com",
      "itemId" : "-KmazkKp5wavdHOczlDS",
      "quantity" : 1,
      "status" : "new"
    },
    "-KpZsw3KHE9oD1CIFQ4R" : {
      "email" : "pbarapatre@gmail.com",
      "itemId" : "-Kmb-ZXfao7VdfenhfYj",
      "quantity" : 1,
      "status" : "new"
    }
  }

"email" <- a user's email id who has initiated the request.
"itemId" <- id of requested item
"quantity" <- item quantity
"status" <- "new" | "approved" | decline.