diff --git a/.changeset/nine-berries-move.md b/.changeset/nine-berries-move.md
new file mode 100644
index 000000000..ec2fb64c2
--- /dev/null
+++ b/.changeset/nine-berries-move.md
@@ -0,0 +1,5 @@
+---
+"@vue-storefront/magento-sdk": patch
+---
+
+[FIXED] Correctly passing properties and options to `customQuery` and `customMutation` SDK methods. Previously, the `customHeaders` option was not being passed properly. Now, all options will be properly passed to the `customQuery` and `customMutation` methods.
diff --git a/packages/api-client/__tests__/mockData/api/storeConfig.ts b/packages/api-client/__tests__/mockData/api/storeConfig.ts
index ee147805c..68a7ec02a 100644
--- a/packages/api-client/__tests__/mockData/api/storeConfig.ts
+++ b/packages/api-client/__tests__/mockData/api/storeConfig.ts
@@ -12,7 +12,7 @@ const STORE_CONFIG_MOCK_RESP = {
     configurable_thumbnail_source: "parent",
     copyright: "Copyright © 2013-present Magento, Inc. All rights reserved.",
     default_description: null,
-    default_display_currency_code: "USD",
+    default_display_currency_code: "EUR",
     default_keywords: null,
     default_title: "Magento Commerce",
     grid_per_page: 12,
@@ -24,7 +24,7 @@ const STORE_CONFIG_MOCK_RESP = {
     list_mode: "grid-list",
     list_per_page: 10,
     list_per_page_values: "5,10,15,20,25",
-    locale: "en_US",
+    locale: expect.any(String),
     logo_alt: null,
     logo_height: null,
     logo_width: null,
diff --git a/packages/sdk/__tests__/unit/customMutation.unit.spec.ts b/packages/sdk/__tests__/unit/customMutation.unit.spec.ts
index fceccb5fb..0f236c9f0 100644
--- a/packages/sdk/__tests__/unit/customMutation.unit.spec.ts
+++ b/packages/sdk/__tests__/unit/customMutation.unit.spec.ts
@@ -3,7 +3,7 @@ import { describeGroup } from './__config__/jest.setup';
 import { client } from '../../src';
 import { MethodBaseOptions } from '../../src/types';
 
-const PARAMS_MOCK = { mutation: '{ __typename }', mutationVariables: {} };
+const PARAMS_MOCK = { mutation: '{ __typename }', mutationVariables: {}, customHeaders: {} };
 const OPTIONS_MOCK = { clientConfig: {}, customHeaders: {} } as MethodBaseOptions;
 const RESPONSE_MOCK = { data: { data: 'some_data', error: null } };
 const ERROR_MOCK = new Error('error');
@@ -24,7 +24,11 @@ describe(describeGroup('customMutation'), () => {
   it('makes a call to API Middleware with proper params and options', async () => {
     await customMutation(PARAMS_MOCK, OPTIONS_MOCK);
 
-    expect(client.post).toBeCalledWith('customMutation', [expect.objectContaining(PARAMS_MOCK), {}], {});
+    expect(client.post).toBeCalledWith(
+      'customMutation',
+      { customHeaders: {}, mutation: '{ __typename }', mutationVariables: {} },
+      {},
+    );
   });
 
   it('extracts and returns a response', async () => {
diff --git a/packages/sdk/__tests__/unit/customQuery.unit.spec.ts b/packages/sdk/__tests__/unit/customQuery.unit.spec.ts
index 537570597..6b844568e 100644
--- a/packages/sdk/__tests__/unit/customQuery.unit.spec.ts
+++ b/packages/sdk/__tests__/unit/customQuery.unit.spec.ts
@@ -24,7 +24,11 @@ describe(describeGroup('customQuery'), () => {
   it('makes a call to API Middleware with proper params and options', async () => {
     await customQuery(PARAMS_MOCK, OPTIONS_MOCK);
 
-    expect(client.post).toBeCalledWith('customQuery', [expect.objectContaining(PARAMS_MOCK), {}], {});
+    expect(client.post).toBeCalledWith(
+      'customQuery',
+      { customHeaders: {}, query: '{ __typename }', queryVariables: {} },
+      {},
+    );
   });
 
   it('extracts and returns a response', async () => {
diff --git a/packages/sdk/src/methods/customMutation/index.ts b/packages/sdk/src/methods/customMutation/index.ts
index c174fcdb3..b2b6e2515 100644
--- a/packages/sdk/src/methods/customMutation/index.ts
+++ b/packages/sdk/src/methods/customMutation/index.ts
@@ -77,7 +77,7 @@ export async function customMutation<RES extends CustomMutationResponse<any>, IN
   return new AxiosRequestSender(client)
     .setUrl('customMutation')
     .setMethod('POST')
-    .setProps([params, options?.customHeaders])
+    .setProps({ ...params, customHeaders: options?.customHeaders })
     .setConfig(options?.clientConfig)
     .send<RES>();
 }
diff --git a/packages/sdk/src/methods/customQuery/index.ts b/packages/sdk/src/methods/customQuery/index.ts
index a6024c030..9a51833d9 100644
--- a/packages/sdk/src/methods/customQuery/index.ts
+++ b/packages/sdk/src/methods/customQuery/index.ts
@@ -92,7 +92,7 @@ export async function customQuery<RES extends CustomQueryResponse<any>, INPUT ex
   return new AxiosRequestSender(client)
     .setUrl('customQuery')
     .setMethod('POST')
-    .setProps([params, options?.customHeaders])
+    .setProps({ ...params, customHeaders: options?.customHeaders })
     .setConfig(options?.clientConfig)
     .send<RES>();
 }