diff --git a/src/aliasRequestApiClient.ts b/src/aliasRequestApiClient.ts
index f4ac2cd5..011ac542 100644
--- a/src/aliasRequestApiClient.ts
+++ b/src/aliasRequestApiClient.ts
@@ -3,6 +3,7 @@ import { MParticleWebSDK } from "./sdkRuntimeModels";
 import Constants from './constants';
 import { FetchUploader, XHRUploader } from './uploaders';
 import { HTTP_ACCEPTED, HTTP_OK } from "./constants";
+import { IIdentityApiClientSendAliasRequest } from "./identityApiClient.interfaces";
 
 
 const { HTTPCodes, Messages } = Constants;
@@ -11,7 +12,7 @@ interface IAliasResponseBody {
     message?: string
 }
 
-export async function sendAliasRequest (mpInstance: MParticleWebSDK, aliasRequest: IAliasRequest, aliasCallback: IAliasCallback) {
+export const sendAliasRequest: IIdentityApiClientSendAliasRequest = async function  (mpInstance: MParticleWebSDK, aliasRequest: IAliasRequest, aliasCallback: IAliasCallback): Promise<void> {
         const { verbose, error } = mpInstance.Logger;
         const { invokeAliasCallback } = mpInstance._Helpers;
         const { aliasUrl } = mpInstance._Store.SDKConfig;
diff --git a/src/identityApiClient.interfaces.ts b/src/identityApiClient.interfaces.ts
new file mode 100644
index 00000000..bbea6585
--- /dev/null
+++ b/src/identityApiClient.interfaces.ts
@@ -0,0 +1,44 @@
+import { IdentityApiData, MPID, UserIdentities } from '@mparticle/web-sdk';
+import {
+    IdentityCallback,
+    IIdentityResponse,
+} from './identity-user-interfaces';
+import {
+    IAliasRequest,
+    IAliasCallback,
+    IIdentityRequest,
+    IdentityAPIMethod,
+    IIdentity,
+} from './identity.interfaces';
+import { MParticleWebSDK } from './sdkRuntimeModels';
+
+export interface IIdentityApiClient {
+    sendAliasRequest: (
+        aliasRequest: IAliasRequest,
+        aliasCallback: IAliasCallback
+    ) => Promise<void>;
+    sendIdentityRequest: (
+        identityApiRequest: IIdentityRequest,
+        method: IdentityAPIMethod,
+        callback: IdentityCallback,
+        originalIdentityApiData: IdentityApiData,
+        parseIdentityResponse: IIdentity['parseIdentityResponse'],
+        mpid: MPID,
+        knownIdentities: UserIdentities
+    ) => Promise<void>;
+    getUploadUrl: (method: IdentityAPIMethod, mpid: MPID) => string;
+    getIdentityResponseFromFetch: (
+        response: Response,
+        responseBody: string
+    ) => IIdentityResponse;
+    getIdentityResponseFromXHR: (response: Response) => IIdentityResponse;
+}
+
+// https://go.mparticle.com/work/SQDSDKS-6568
+// https://go.mparticle.com/work/SQDSDKS-6679
+// Combine with `sendIdentityRequest` above once module is fully migrated
+export type IIdentityApiClientSendAliasRequest = (
+    mpInstance: MParticleWebSDK,
+    aliasRequest: IAliasRequest,
+    aliasCallback: IAliasCallback
+) => Promise<void>;
diff --git a/test/src/tests-aliasRequestApiClient.ts b/test/src/tests-aliasRequestApiClient.ts
index b40567e0..10e47e6e 100644
--- a/test/src/tests-aliasRequestApiClient.ts
+++ b/test/src/tests-aliasRequestApiClient.ts
@@ -4,7 +4,7 @@ import { urls, apiKey, MPConfig, testMPID } from './config/constants';
 import { MParticleWebSDK } from '../../src/sdkRuntimeModels';
 import { expect } from 'chai';
 import { sendAliasRequest } from '../../src/aliasRequestApiClient';
-import { IAliasCallback, IAliasRequest } from '../../src/identity.interfaces';
+import { IAliasRequest } from '../../src/identity.interfaces';
 import { HTTP_ACCEPTED, HTTP_BAD_REQUEST, HTTP_FORBIDDEN, HTTP_OK } from '../../src/constants';
 
 declare global {