diff --git a/Virtusize/Sources/Internal/Models/VirtusizeGetSizeParams.swift b/Virtusize/Sources/Internal/Models/VirtusizeGetSizeParams.swift
index dd4811bb..87573b02 100644
--- a/Virtusize/Sources/Internal/Models/VirtusizeGetSizeParams.swift
+++ b/Virtusize/Sources/Internal/Models/VirtusizeGetSizeParams.swift
@@ -53,7 +53,7 @@ internal struct VirtusizeGetSizeParams: Codable {
         userBodyProfile: VirtusizeUserBodyProfile?
 
     ) {
-       let additionalInfo = [
+       var additionalInfo: [String: VirtusizeAnyCodable] = [
             "brand": VirtusizeAnyCodable(
                 storeProduct.storeProductMeta?.additionalInfo?.brand ?? storeProduct.storeProductMeta?.brand ?? ""
             ),
@@ -63,14 +63,17 @@ internal struct VirtusizeGetSizeParams: Codable {
             "sizes": VirtusizeAnyCodable(
                 storeProduct.storeProductMeta?.additionalInfo?.sizes ?? [:]
             ),
-            "modelInfo": VirtusizeAnyCodable(getModelInfoDict(storeProduct: storeProduct)),
             "gender": VirtusizeAnyCodable(
                 storeProduct.storeProductMeta?.additionalInfo?.gender ?? "male"
             ),
             "style": VirtusizeAnyCodable(
                 storeProduct.storeProductMeta?.additionalInfo?.style ?? "regular"
-            ),
+            )
         ]
+        
+        if let modelInfo = getModelInfoDict(storeProduct: storeProduct) {
+            additionalInfo["modelInfo"] = VirtusizeAnyCodable(modelInfo)
+        }
         bodyData = getBodyDataDict(userBodyProfile: userBodyProfile)
         let itemSizesOrig = getItemSizesDict(storeProduct: storeProduct)
         var productType = ""
diff --git a/Virtusize/Sources/Models/VirtusizeEnvironment.swift b/Virtusize/Sources/Models/VirtusizeEnvironment.swift
index 097c87c9..93a5f254 100644
--- a/Virtusize/Sources/Models/VirtusizeEnvironment.swift
+++ b/Virtusize/Sources/Models/VirtusizeEnvironment.swift
@@ -69,9 +69,9 @@ public enum VirtusizeEnvironment: String, CaseIterable {
     internal func getSizeUrl() -> String {
 		switch self {
 		case .TESTING:
-			return "size-recommendation.virtusize.jp"
+			return "size-recommendation.staging.virtusize.jp"
 		case .STAGING:
-			return "size-recommendation.virtusize.com"
+			return "size-recommendation.staging.virtusize.jp"
 		case .GLOBAL:
 			return "size-recommendation.virtusize.com"
 		case .JAPAN:
diff --git a/Virtusize/Tests/APIEndpointsTests.swift b/Virtusize/Tests/APIEndpointsTests.swift
index 3f95b350..8a73447d 100644
--- a/Virtusize/Tests/APIEndpointsTests.swift
+++ b/Virtusize/Tests/APIEndpointsTests.swift
@@ -177,7 +177,7 @@ class APIEndpointsTests: XCTestCase {
     func testGetSizeEndpoint_returnExpectedComponents() {
         let endpoint = APIEndpoints.getItemSizeRecommendation
 
-        XCTAssertEqual(endpoint.components.host, "size-recommendation.virtusize.com")
+        XCTAssertEqual(endpoint.components.host, "size-recommendation.staging.virtusize.jp")
         XCTAssertEqual(endpoint.components.path, "/item")
 
         XCTAssertNil(endpoint.components.queryItems)
diff --git a/Virtusize/Tests/APIRequestTests.swift b/Virtusize/Tests/APIRequestTests.swift
index 2ea1b845..bc39ab86 100644
--- a/Virtusize/Tests/APIRequestTests.swift
+++ b/Virtusize/Tests/APIRequestTests.swift
@@ -213,7 +213,7 @@ class APIRequestTests: XCTestCase {
         XCTAssertEqual(actualParams?.items.first?.productType, "jacket")
 		XCTAssertEqual(
 			apiRequest?.url?.absoluteString,
-			"https://size-recommendation.virtusize.com/item"
+			"https://size-recommendation.staging.virtusize.jp/item"
 		)
     }
 }
diff --git a/Virtusize/Tests/VirtusizeGetSizeParamsTests.swift b/Virtusize/Tests/VirtusizeGetSizeParamsTests.swift
index 5d8c0fd1..45d78ed1 100644
--- a/Virtusize/Tests/VirtusizeGetSizeParamsTests.swift
+++ b/Virtusize/Tests/VirtusizeGetSizeParamsTests.swift
@@ -238,7 +238,6 @@ class VirtusizeGetSizeParamsTests: XCTestCase {
                             "brand": "",
                             "fit": "regular",
                             "sizes": {},
-                            "modelInfo": null,
                             "gender": "null",
                             "style": "fashionable"
                         },