diff --git a/src/rules.json b/src/rules.json
index 9ea7a83c..102434fa 100644
--- a/src/rules.json
+++ b/src/rules.json
@@ -118,5 +118,38 @@
         }
       }
     }
+  },
+  {
+    "ruleId": 4,
+    "description": "verify received thirdparty transaction request",
+    "conditions": {
+      "all": [
+        {
+          "fact": "path",
+          "operator": "equal",
+          "value": "/validate-thirdparty-transaction-request"
+        },
+        {
+          "fact": "method",
+          "operator": "equal",
+          "value": "POST"
+        }
+      ]
+    },
+    "event": {
+      "type": "FIXED_CALLBACK",
+      "params": {
+        "statusCode": 200,
+        "body": {
+          "isValid": true,
+          "payerPartyIdInfo": {
+            "partyIdType": "MSISDN",
+            "partyIdentifier": "123456789",
+            "fspId": "dfspa"
+          },
+          "consentId": "46876aac-5db8-4353-bb3c-a6a905843ce7"
+        }
+      }
+    }
   }
 ]
\ No newline at end of file
diff --git a/src/simulator/api.yaml b/src/simulator/api.yaml
index f52f2477..b3a24549 100644
--- a/src/simulator/api.yaml
+++ b/src/simulator/api.yaml
@@ -1059,7 +1059,7 @@ components:
           $ref: '#/components/schemas/initiatorType'
           description: Specifies the type of the transaction initiator
         geoCode:
-          $ref: '#/components/schemas/geoCode'
+          $ref: '#/components/schemas/GeoCode'
           description: Longitude and Latitude of the initiating Party. Can be used to detect fraud.
         note:
           type: string
@@ -1107,7 +1107,7 @@ components:
           $ref: '#/components/schemas/initiatorType'
           description: Specifies the type of the transaction initiator
         geoCode:
-          $ref: '#/components/schemas/geoCode'
+          $ref: '#/components/schemas/GeoCode'
           description: Longitude and Latitude of the initiating Party. Can be used to detect fraud.
         note:
           type: string
@@ -1185,7 +1185,7 @@ components:
           $ref: '#/components/schemas/timestamp'
           description: Timestamp specifying the validity period of the quotation
         geoCode:
-          $ref: '#/components/schemas/geoCode'
+          $ref: '#/components/schemas/GeoCode'
           description: Longitude and Latitude of the Payee. Can be used to detect fraud
 
     transactionRequestResponse:
@@ -1852,7 +1852,7 @@ components:
           $ref: '#/components/schemas/transferParty'
           description: Information about the Payer in the proposed financial transaction.
         geoCode:
-          $ref: '#/components/schemas/geoCode'
+          $ref: '#/components/schemas/GeoCode'
           description: Longitude and Latitude of the initiating Party. Can be used to detect fraud.
         expiration:
           $ref: '#/components/schemas/timestamp'
@@ -1978,7 +1978,7 @@ components:
           $ref: '#/components/schemas/timestamp'
           description: Timestamp specifying the validity period of the quotation
         geoCode:
-          $ref: '#/components/schemas/geoCode'
+          $ref: '#/components/schemas/GeoCode'
           description: Longitude and Latitude of the Payee. Can be used to detect fraud
         extensionList:
           $ref: '#/components/schemas/extensionList'
@@ -2068,28 +2068,6 @@ components:
       type: string
       description: A Mojaloop API transfer identifier (UUID)
 
-    geoCode:
-      type: object
-      description: Indicates the geographic location from where the transaction was initiated.
-      properties:
-        latitude:
-          $ref: '#/components/schemas/latitude'
-        longitude:
-          $ref: '#/components/schemas/longitude'
-      required:
-        - latitude
-        - longitude
-
-    latitude:
-      type: string
-      pattern: ^(\+|-)?(?:90(?:(?:\.0{1,6})?)|(?:[0-9]|[1-8][0-9])(?:(?:\.[0-9]{1,6})?))$
-      description: The API data type Latitude is a JSON String in a lexical format that is restricted by a regular expression for interoperability reasons.
-
-    longitude:
-      type: string
-      pattern: ^(\+|-)?(?:180(?:(?:\.0{1,6})?)|(?:[0-9]|[1-9][0-9]|1[0-7][0-9])(?:(?:\.[0-9]{1,6})?))$
-      description: The API data type Longitude is a JSON String in a lexical format that is restricted by a regular expression for interoperability reasons.
-
     errorResponse:
       type: object
       properties:
@@ -2682,7 +2660,7 @@ components:
           $ref: '#/components/schemas/transferParty'
           description: Information about the Payer in the proposed financial transaction.
         geoCode:
-          $ref: '#/components/schemas/geoCode'
+          $ref: '#/components/schemas/GeoCode'
           description: Longitude and Latitude of the initiating Party. Can be used to detect fraud.
         expiration:
           $ref: '#/components/schemas/timestamp'
@@ -2887,23 +2865,6 @@ components:
       type: string
       description: A Mojaloop API transfer identifier (UUID)
           
-    geoCode:
-      type: object
-      description: Data model for the complex type PartyIdInfo.
-      properties:
-        partyIdType:
-          $ref: '#/components/schemas/PartyIdTypeTPLink'
-        partyIdentifier:
-          $ref: '#/components/schemas/PartyIdentifier'
-        partySubIdOrType:
-          $ref: '#/components/schemas/PartySubIdOrType'
-        fspId:
-          $ref: '#/components/schemas/FspId'
-        extensionList:
-          $ref: '#/components/schemas/ExtensionList'
-      required:
-        - partyIdType
-        - partyIdentifier
     PartyIdType:
       title: PartyIdType
       type: string
@@ -3015,17 +2976,24 @@ components:
 
         - THIRD_PARTY_LINK - TBD
       example: PERSONAL_ID
-    PartyIdentifier:
-      title: PartyIdentifier
-      pattern: ^(\+|-)?(?:90(?:(?:\.0{1,6})?)|(?:[0-9]|[1-8][0-9])(?:(?:\.[0-9]{1,6})?))$
-      description: The API data type Latitude is a JSON String in a lexical format that is restricted by a regular expression for interoperability reasons.
-    
+   
+ 
     longitude:
       type: string
       minLength: 1
       maxLength: 128
+      pattern: ^(\+|-)?(?:90(?:(?:\.0{1,6})?)|(?:[0-9]|[1-8][0-9])(?:(?:\.[0-9]{1,6})?))$
+      description: The API data type Latitude is a JSON String in a lexical format that is restricted by a regular expression for interoperability reasons.
+    
+    PartyIdentifier:
+      title: PartyIdentifier
       description: Identifier of the Party.
       example: '16135551212'
+      type: string
+      minLength: 1
+      maxLength: 128
+
+
     PartySubIdOrType:
       title: PartySubIdOrType
       type: string
diff --git a/src/test/integration/simulator/handlers.test.js b/src/test/integration/simulator/handlers.test.js
index 86c163f0..4ce435eb 100644
--- a/src/test/integration/simulator/handlers.test.js
+++ b/src/test/integration/simulator/handlers.test.js
@@ -1,4 +1,5 @@
 const axios = require('axios');
+const { v4 } = require('uuid');
 
 const axiosConfig = {
     headers: {
@@ -65,4 +66,48 @@ describe('handlers', () => {
         // Assert
         expect(result).toStrictEqual(expected);
     });
+
+    it('POST /validate-thirdparty-transaction-request a FIXED_CALLBACK`', async () => {
+        // Arrange
+        const payload = {
+            transactionRequestId: v4(),
+            payee: {
+                partyIdInfo: {
+                    partyIdType: 'MSISDN',
+                    partyIdentifier: '4412345678',
+                },
+            },
+            payer: {
+                partyIdType: 'THIRD_PARTY_LINK',
+                partyIdentifier: 'qwerty1234',
+            },
+            amountType: 'SEND',
+            amount: {
+                currency: 'USD',
+                amount: '100',
+            },
+            transactionType: {
+                scenario: 'TRANSFER',
+                initiator: 'PAYER',
+                initiatorType: 'CONSUMER',
+            },
+            expiration: (new Date()).toISOString(),
+        };
+        const expected = {
+            isValid: true,
+            payerPartyIdInfo: {
+                partyIdType: 'MSISDN',
+                partyIdentifier: '123456789',
+                fspId: 'dfspa',
+            },
+            consentId: '46876aac-5db8-4353-bb3c-a6a905843ce7',
+        };
+        const uri = 'http://localhost:3000/validate-thirdparty-transaction-request';
+
+        // Act
+        const result = (await axios.post(uri, payload, axiosConfig)).data;
+
+        // Assert
+        expect(result).toStrictEqual(expected);
+    });
 });