diff --git a/packages/hoppscotch-common/src/services/oauth/flows/authCode.ts b/packages/hoppscotch-common/src/services/oauth/flows/authCode.ts
index 5bd4012a..2558b0db 100644
--- a/packages/hoppscotch-common/src/services/oauth/flows/authCode.ts
+++ b/packages/hoppscotch-common/src/services/oauth/flows/authCode.ts
@@ -12,26 +12,24 @@ import * as E from "fp-ts/Either"
 import { KernelInterceptorService } from "~/services/kernel-interceptor.service"
 import { content } from "@hoppscotch/kernel"
 import { refreshToken, OAuth2ParamSchema } from "../utils"
+import {
+  AuthCodeGrantTypeParams,
+  OAuth2AuthRequestParam,
+} from "@hoppscotch/data"
 
 const persistenceService = getService(PersistenceService)
 const interceptorService = getService(KernelInterceptorService)
 
-const AuthCodeOauthFlowParamsSchema = z
-  .object({
-    authEndpoint: z.string(),
-    tokenEndpoint: z.string(),
-    clientID: z.string(),
-    clientSecret: z.string().optional(),
-    scopes: z.string().optional(),
-    isPKCE: z.boolean(),
-    codeVerifierMethod: z.enum(["plain", "S256"]).optional(),
-    authRequestParams: z.array(
-      OAuth2ParamSchema.omit({
-        sendIn: true,
-      })
-    ),
-    refreshRequestParams: z.array(OAuth2ParamSchema),
+// Use the existing schema from hoppscotch-data but ensure required arrays
+const AuthCodeOauthFlowParamsSchema = AuthCodeGrantTypeParams.omit({
+  grantType: true,
+  token: true,
+})
+  .extend({
+    // Override optional arrays to be required for the service layer
+    authRequestParams: z.array(OAuth2AuthRequestParam),
     tokenRequestParams: z.array(OAuth2ParamSchema),
+    refreshRequestParams: z.array(OAuth2ParamSchema),
   })
   .refine(
     (params) => {
diff --git a/packages/hoppscotch-common/src/services/oauth/flows/clientCredentials.ts b/packages/hoppscotch-common/src/services/oauth/flows/clientCredentials.ts
index 1803ce79..57604e0d 100644
--- a/packages/hoppscotch-common/src/services/oauth/flows/clientCredentials.ts
+++ b/packages/hoppscotch-common/src/services/oauth/flows/clientCredentials.ts
@@ -12,16 +12,20 @@ import { KernelInterceptorService } from "~/services/kernel-interceptor.service"
 import { RelayRequest, content } from "@hoppscotch/kernel"
 import { parseBytesToJSON } from "~/helpers/functional/json"
 import { refreshToken, OAuth2ParamSchema } from "../utils"
+import { ClientCredentialsGrantTypeParams } from "@hoppscotch/data"
 
 const interceptorService = getService(KernelInterceptorService)
 
-const ClientCredentialsFlowParamsSchema = z
-  .object({
-    authEndpoint: z.string(),
-    clientID: z.string(),
-    clientSecret: z.string().optional(),
-    scopes: z.string().optional(),
+// Use the existing schema from hoppscotch-data but add client authentication mode
+const ClientCredentialsFlowParamsSchema = ClientCredentialsGrantTypeParams.omit(
+  {
+    grantType: true,
+    token: true,
+  }
+)
+  .extend({
     clientAuthentication: z.enum(["AS_BASIC_AUTH_HEADERS", "IN_BODY"]),
+    // Override optional arrays to be required for the service layer
     tokenRequestParams: z.array(OAuth2ParamSchema),
     refreshRequestParams: z.array(OAuth2ParamSchema),
   })
diff --git a/packages/hoppscotch-common/src/services/oauth/flows/implicit.ts b/packages/hoppscotch-common/src/services/oauth/flows/implicit.ts
index d1226c10..6d587ea7 100644
--- a/packages/hoppscotch-common/src/services/oauth/flows/implicit.ts
+++ b/packages/hoppscotch-common/src/services/oauth/flows/implicit.ts
@@ -8,20 +8,22 @@ import {
 import { z } from "zod"
 import { getService } from "~/modules/dioc"
 import * as E from "fp-ts/Either"
+import {
+  ImplicitOauthFlowParams as ImplicitOauthFlowParamsData,
+  OAuth2AuthRequestParam,
+} from "@hoppscotch/data"
 import { OAuth2ParamSchema } from "../utils"
 
 const persistenceService = getService(PersistenceService)
 
-const ImplicitOauthFlowParamsSchema = z
-  .object({
-    authEndpoint: z.string(),
-    clientID: z.string(),
-    scopes: z.string().optional(),
-    authRequestParams: z.array(
-      OAuth2ParamSchema.omit({
-        sendIn: true,
-      })
-    ),
+// Use the existing schema from hoppscotch-data
+const ImplicitOauthFlowParamsSchema = ImplicitOauthFlowParamsData.omit({
+  grantType: true,
+  token: true,
+})
+  .extend({
+    // Override optional arrays to be required for the service layer
+    authRequestParams: z.array(OAuth2AuthRequestParam),
     refreshRequestParams: z.array(OAuth2ParamSchema),
   })
   .refine((params) => {
diff --git a/packages/hoppscotch-common/src/services/oauth/flows/password.ts b/packages/hoppscotch-common/src/services/oauth/flows/password.ts
index 6f9d8497..f48e4748 100644
--- a/packages/hoppscotch-common/src/services/oauth/flows/password.ts
+++ b/packages/hoppscotch-common/src/services/oauth/flows/password.ts
@@ -11,18 +11,18 @@ import { KernelInterceptorService } from "~/services/kernel-interceptor.service"
 import { useToast } from "~/composables/toast"
 import { content } from "@hoppscotch/kernel"
 import { parseBytesToJSON } from "~/helpers/functional/json"
-import { OAuth2ParamSchema, refreshToken } from "../utils"
+import { refreshToken, OAuth2ParamSchema } from "../utils"
+import { PasswordGrantTypeParams } from "@hoppscotch/data"
 
 const interceptorService = getService(KernelInterceptorService)
 
-const PasswordFlowParamsSchema = z
-  .object({
-    authEndpoint: z.string(),
-    clientID: z.string(),
-    clientSecret: z.string().optional(),
-    scopes: z.string().optional(),
-    username: z.string(),
-    password: z.string(),
+// Use the existing schema from hoppscotch-data
+const PasswordFlowParamsSchema = PasswordGrantTypeParams.omit({
+  grantType: true,
+  token: true,
+})
+  .extend({
+    // Override optional arrays to be required for the service layer
     tokenRequestParams: z.array(OAuth2ParamSchema),
     refreshRequestParams: z.array(OAuth2ParamSchema),
   })
diff --git a/packages/hoppscotch-common/src/services/oauth/utils.ts b/packages/hoppscotch-common/src/services/oauth/utils.ts
index 7cb9e54f..bd4877c9 100644
--- a/packages/hoppscotch-common/src/services/oauth/utils.ts
+++ b/packages/hoppscotch-common/src/services/oauth/utils.ts
@@ -4,6 +4,7 @@ import { getService } from "~/modules/dioc"
 import { KernelInterceptorService } from "~/services/kernel-interceptor.service"
 import { content } from "@hoppscotch/kernel"
 import { decodeResponseAsJSON } from "./oauth.service"
+import { OAuth2AdvancedParam } from "@hoppscotch/data"
 
 const interceptorService = getService(KernelInterceptorService)
 
@@ -110,13 +111,9 @@ export const refreshToken = async ({
 }
 
 /**
- * Common OAuth2 parameter schema with all possible fields
- * Used as base for both auth requests and advanced token/refresh requests
+ * Common OAuth2 parameter schema
+ * Used for all OAuth parameter types - omit sendIn field where not needed
  */
-export const OAuth2ParamSchema = z.object({
-  id: z.number(),
-  key: z.string(),
-  value: z.string(),
-  active: z.boolean(),
+export const OAuth2ParamSchema = OAuth2AdvancedParam.extend({
   sendIn: z.enum(["headers", "url", "body"]).optional(),
 })
diff --git a/packages/hoppscotch-data/src/rest/index.ts b/packages/hoppscotch-data/src/rest/index.ts
index d2014249..012f7cb4 100644
--- a/packages/hoppscotch-data/src/rest/index.ts
+++ b/packages/hoppscotch-data/src/rest/index.ts
@@ -62,6 +62,8 @@ export { ImplicitOauthFlowParams } from "./v/15/auth"
 export {
   HoppRESTAuthOAuth2,
   ClientCredentialsGrantTypeParams,
+  OAuth2AdvancedParam,
+  OAuth2AuthRequestParam,
 } from "./v/15/auth"
 
 export {
diff --git a/packages/hoppscotch-data/src/rest/v/15/auth.ts b/packages/hoppscotch-data/src/rest/v/15/auth.ts
index eace3b74..b76a4c60 100644
--- a/packages/hoppscotch-data/src/rest/v/15/auth.ts
+++ b/packages/hoppscotch-data/src/rest/v/15/auth.ts
@@ -20,7 +20,7 @@ import { ImplicitOauthFlowParams as ImplicitOauthFlowParamsOld } from "../3"
 export { HoppRESTAuthJWT } from "../13/auth"
 
 // Define the OAuth2 advanced parameter structure
-const OAuth2AdvancedParam = z.object({
+export const OAuth2AdvancedParam = z.object({
   id: z.number(),
   key: z.string(),
   value: z.string(),
@@ -29,7 +29,7 @@ const OAuth2AdvancedParam = z.object({
 })
 
 // omit sendIn from OAuth2AuthRequestParam
-const OAuth2AuthRequestParam = OAuth2AdvancedParam.omit({ sendIn: true })
+export const OAuth2AuthRequestParam = OAuth2AdvancedParam.omit({ sendIn: true })
 
 export const AuthCodeGrantTypeParams = AuthCodeGrantTypeParamsOld.extend({
   authRequestParams: z.array(OAuth2AuthRequestParam).optional().default([]),