diff --git a/adapters/vastbidder/bidder_macro.go b/adapters/vastbidder/bidder_macro.go
index 1979a829e83..d12bb6d4183 100644
--- a/adapters/vastbidder/bidder_macro.go
+++ b/adapters/vastbidder/bidder_macro.go
@@ -287,12 +287,13 @@ func (tag *BidderMacro) MacroPaymentIDChain(key string) string {
 	return ""
 }
 
+// MacroSchain contains definition for Schain Parameter
 func (tag *BidderMacro) MacroSchain(key string) string {
 	if tag.Request.Source == nil || tag.Request.Source.Ext == nil {
 		return ""
 	}
 
-	schain, _, _, err := jsonparser.Get(tag.Request.Source.Ext, "schain")
+	schain, _, _, err := jsonparser.Get(tag.Request.Source.Ext, MacroSchain)
 
 	if err != nil {
 		return ""
@@ -305,51 +306,48 @@ func (tag *BidderMacro) MacroSchain(key string) string {
 		return ""
 	}
 
-	serializedSchain := schainObj.Ver + "," + fmt.Sprintf("%v", schainObj.Complete)
+	var serializedSchain strings.Builder
 
-	// count track the current index for schain node
-	count := 0
-	l := len(schainObj.Nodes)
+	serializedSchain.WriteString(schainObj.Ver + "," + fmt.Sprintf("%v", schainObj.Complete))
 
 	for _, node := range schainObj.Nodes {
-		if count < l {
-			serializedSchain += "!"
-		}
+
+		serializedSchain.WriteString("!")
+
 		if node.ASI != "" {
-			serializedSchain += url.PathEscape(node.ASI) + ","
+			serializedSchain.WriteString(url.PathEscape(node.ASI) + ",")
 		} else {
-			serializedSchain += ","
+			serializedSchain.WriteString(",")
 		}
 		if node.SID != "" {
-			serializedSchain += url.PathEscape(node.SID) + ","
+			serializedSchain.WriteString(url.PathEscape(node.SID) + ",")
 		} else {
-			serializedSchain += ","
+			serializedSchain.WriteString(",")
 		}
 		if node.HP != nil {
-			serializedSchain += url.PathEscape(fmt.Sprintf("%v", *node.HP)) + ","
+			// node.HP is integer pointer so 1st dereference it then convert it to string and push to serializedSchain
+			serializedSchain.WriteString(url.PathEscape(fmt.Sprintf("%v", *node.HP)) + ",")
 		} else {
-			serializedSchain += ","
+			serializedSchain.WriteString(",")
 		}
 		if node.RID != "" {
-			serializedSchain += url.PathEscape(node.RID) + ","
+			serializedSchain.WriteString(url.PathEscape(node.RID) + ",")
 		} else {
-			serializedSchain += ","
+			serializedSchain.WriteString(",")
 		}
 		if node.Name != "" {
-			serializedSchain += url.PathEscape(node.Name) + ","
+			serializedSchain.WriteString(url.PathEscape(node.Name) + ",")
 		} else {
-			serializedSchain += ","
+			serializedSchain.WriteString(",")
 		}
 		if node.Domain != "" {
-			serializedSchain += url.PathEscape(node.Domain)
-		} else if node.Ext != nil {
-			serializedSchain += ","
-			serializedSchain += url.QueryEscape(string(node.Ext)) // PathEscape() does not encode the : , & and to check
+			serializedSchain.WriteString(url.PathEscape(node.Domain))
+		}
+		if node.Ext != nil {
+			serializedSchain.WriteString("," + url.QueryEscape(string(node.Ext)))
 		}
-
 	}
-
-	return serializedSchain
+	return serializedSchain.String()
 }
 
 /********************* Regs *********************/
diff --git a/adapters/vastbidder/bidder_macro_test.go b/adapters/vastbidder/bidder_macro_test.go
index 1d708a295b4..de90aa4a2b2 100644
--- a/adapters/vastbidder/bidder_macro_test.go
+++ b/adapters/vastbidder/bidder_macro_test.go
@@ -1620,7 +1620,7 @@ func TestBidderMacroKVM(t *testing.T) {
 	}
 }
 
-func TestBidderMacro_MacroSchain(t *testing.T) {
+func TestMacroSchain(t *testing.T) {
 
 	type fields struct {
 		Request *openrtb2.BidRequest
@@ -1692,7 +1692,7 @@ func TestBidderMacro_MacroSchain(t *testing.T) {
 		},
 
 		{
-			name: "nodes_with_missing_optional_parameters",
+			name: "node_with_missing_all_optional_parameters",
 			fields: fields{&openrtb2.BidRequest{Source: &openrtb2.Source{
 				Ext: []byte(`{
 					"schain":{
@@ -1711,6 +1711,27 @@ func TestBidderMacro_MacroSchain(t *testing.T) {
 			args: args{key: "schain"},
 			want: "1.0,1!exchange1.com,1234&abcd,1,,,",
 		},
+		{
+			name: "nodes_with_missing_some_optional_parameters",
+			fields: fields{&openrtb2.BidRequest{Source: &openrtb2.Source{
+				Ext: []byte(`{
+					"schain":{
+						"complete":1,
+						"nodes":[
+							{
+								"asi":"exchange1.com",
+								"sid":"1234&abcd",
+								"hp":1,
+								"name":"publisher name"
+							}
+						],
+						"ver":"1.0"
+					}
+				}`),
+			}}},
+			args: args{key: "schain"},
+			want: "1.0,1!exchange1.com,1234&abcd,1,,publisher%20name,",
+		},
 		{
 			name: "nodes_with_extension_and_missing_optional_parameters",
 			fields: fields{&openrtb2.BidRequest{Source: &openrtb2.Source{
@@ -1732,6 +1753,66 @@ func TestBidderMacro_MacroSchain(t *testing.T) {
 			args: args{key: "schain"},
 			want: "1.0,1!exchange1.com,1234&abcd,1,,,,%7B%22k1%22%3A%22v1%22%7D",
 		},
+		{
+			name: "multi_nodes_with_extension",
+			fields: fields{&openrtb2.BidRequest{Source: &openrtb2.Source{
+				Ext: []byte(`{
+					"schain":{
+						"complete":1,
+						"nodes":[
+							{
+								"asi":"exchange1.com",
+								"sid":"1234&abcd",
+								"rid":"bid-request-1",
+								"name":"publisher name",
+								"domain":"publisher.com",
+								"hp":1,
+								"ext": "hello"
+							} ,
+							{
+								"asi":"exchange2.com",
+								"sid":"abc,d",
+								"rid":"bid-request-2",
+								"name":"intermediary",
+								"domain":"intermediary.com",
+								"hp":1,
+								"ext":{"name":"test","num":1}
+							}
+						],
+						"ver":"1.0"
+					}
+				}`),
+			}}},
+			args: args{key: "schain"},
+			want: "1.0,1!exchange1.com,1234&abcd,1,bid-request-1,publisher%20name,publisher.com,%22hello%22!exchange2.com,abc%2Cd,1,bid-request-2,intermediary,intermediary.com,%7B%22name%22%3A%22test%22%2C%22num%22%3A1%7D",
+		},
+		{
+			name: "missing_schain_object",
+			fields: fields{&openrtb2.BidRequest{Source: &openrtb2.Source{
+				Ext: []byte(`{
+					"somechain":{
+						"complete":1,
+						"nodes":[
+							{
+								"asi":"exchange1.com",
+								"sid":"1234&abcd",
+								"hp":1,
+								"ext":{"k1":"v1"}
+							}
+						],
+						"ver":"1.0"
+					}
+				}`),
+			}}},
+			args: args{key: "schain"},
+			want: "",
+		},
+		{
+			name:   "nil_schain_object",
+			fields: fields{&openrtb2.BidRequest{Source: nil}},
+			args:   args{key: "schain"},
+			want:   "",
+		},
 	}
 
 	for _, tt := range tests {