diff --git a/spec/api/cart.spec.js b/spec/api/cart.spec.js
index 71919a4..8ba7508 100644
--- a/spec/api/cart.spec.js
+++ b/spec/api/cart.spec.js
@@ -81,3 +81,50 @@ describe('Cart Api Class', () => {
         expect(cart.makeRequest).toHaveBeenCalled();
     });
 });
+
+describe('getShippingQuotes', () => {
+    let cart;
+
+    beforeEach(() => {
+        cart = new CartApi();
+        cart.remoteRequest = jest.fn();
+    });
+
+    // Mirrors: utils.api.cart.getShippingQuotes(params, 'cart/shipping-quotes', callback)
+    test('3-arg call (no requestOptions): template and params are forwarded', () => {
+        const callback = jest.fn();
+
+        cart.getShippingQuotes({ zip: '10001' }, 'cart/shipping-quotes', callback);
+
+        expect(cart.remoteRequest).toHaveBeenCalledWith(
+            '/shipping-quote',
+            'GET',
+            expect.objectContaining({ params: { zip: '10001' }, template: 'cart/shipping-quotes' }),
+            callback,
+        );
+    });
+
+    // Mirrors: utils.api.cart.getShippingQuotes(params, 'cart/shipping-quotes', callback, { baseUrl: secureBaseUrl })
+    test('4-arg call (with baseUrl): baseUrl is forwarded and template is not overwritten', () => {
+        const callback = jest.fn();
+
+        cart.getShippingQuotes({ zip: '10001' }, 'cart/shipping-quotes', callback, { baseUrl: 'https://store.example.com/es' });
+
+        const [, , passedOptions] = cart.remoteRequest.mock.calls[0];
+        expect(passedOptions.baseUrl).toBe('https://store.example.com/es');
+        expect(passedOptions.template).toBe('cart/shipping-quotes');
+        expect(passedOptions.params).toEqual({ zip: '10001' });
+    });
+
+    // Regression: baseUrl must not be silently dropped when renderWith is omitted
+    test('3-arg call without renderWith (params, callback, requestOptions): baseUrl is forwarded', () => {
+        const callback = jest.fn();
+
+        cart.getShippingQuotes({ zip: '10001' }, callback, { baseUrl: 'https://store.example.com/es' });
+
+        const [, , passedOptions, actualCallback] = cart.remoteRequest.mock.calls[0];
+        expect(actualCallback).toBe(callback);
+        expect(passedOptions.baseUrl).toBe('https://store.example.com/es');
+        expect(passedOptions.params).toEqual({ zip: '10001' });
+    });
+});
diff --git a/spec/api/product-attributes.spec.js b/spec/api/product-attributes.spec.js
new file mode 100644
index 0000000..d731260
--- /dev/null
+++ b/spec/api/product-attributes.spec.js
@@ -0,0 +1,103 @@
+import Base from '../../src/api/base';
+import ProductAttributes from '../../src/api/product-attributes';
+
+jest.mock('../../src/api/base');
+
+describe('ProductAttributes', () => {
+    let productAttributes;
+
+    beforeEach(() => {
+        Base.prototype.remoteRequest = jest.fn();
+        productAttributes = new ProductAttributes();
+    });
+
+    describe('optionChange', () => {
+        // Mirrors: optionChange(simpleProductId, $form.serialize(), (err, response) => { ... })
+        test('3-arg call (no template, no baseUrl): callback is invoked with server response', () => {
+            const fakeResponse = { data: { stock: 5 } };
+            Base.prototype.remoteRequest = jest.fn((url, method, options, internalCb) => {
+                internalCb(null, fakeResponse);
+            });
+            productAttributes = new ProductAttributes();
+            const callback = jest.fn();
+
+            productAttributes.optionChange(99, 'qty=1', callback);
+
+            expect(callback).toHaveBeenCalledWith(null, fakeResponse);
+            expect(productAttributes.remoteRequest).toHaveBeenCalledWith(
+                '/product-attributes/99',
+                'POST',
+                expect.objectContaining({ template: null }),
+                expect.any(Function),
+            );
+        });
+
+        // Mirrors: optionChange(productId, $form.serialize(), 'products/bulk-discount-rates', (err, response) => { ... }, { baseUrl: this.context.secureBaseUrl })
+        test('5-arg call (template + baseUrl): callback is invoked and baseUrl is forwarded', () => {
+            const fakeResponse = { data: { price: '$9.99' }, content: '<div/>' };
+            Base.prototype.remoteRequest = jest.fn((url, method, options, internalCb) => {
+                internalCb(null, fakeResponse);
+            });
+            productAttributes = new ProductAttributes();
+            const callback = jest.fn();
+
+            productAttributes.optionChange(99, 'qty=1', 'products/bulk-discount-rates', callback, { baseUrl: 'https://store.example.com/es' });
+
+            expect(callback).toHaveBeenCalledWith(null, fakeResponse);
+            const [, , passedOptions] = productAttributes.remoteRequest.mock.calls[0];
+            expect(passedOptions.template).toBe('products/bulk-discount-rates');
+            expect(passedOptions.baseUrl).toBe('https://store.example.com/es');
+        });
+    });
+
+    describe('configureInCart', () => {
+        test('template + baseUrl stay top-level (flat merge)', () => {
+            const callback = jest.fn();
+
+            productAttributes.configureInCart(
+                'item-abc',
+                { template: 'cart/modals/configure-product' },
+                callback,
+                { baseUrl: 'https://store.example.com/es' },
+            );
+
+            expect(productAttributes.remoteRequest).toHaveBeenCalledWith(
+                '/configure-options/item-abc',
+                'GET',
+                expect.objectContaining({
+                    template: 'cart/modals/configure-product',
+                    baseUrl: 'https://store.example.com/es',
+                }),
+                expect.any(Function),
+            );
+        });
+
+        test('flat merge: extra keys from first arg and baseUrl from requestOptions', () => {
+            const callback = jest.fn();
+
+            productAttributes.configureInCart('item-abc', { qty: 1 }, callback, { baseUrl: 'https://store.example.com/es' });
+
+            expect(productAttributes.remoteRequest).toHaveBeenCalledWith(
+                '/configure-options/item-abc',
+                'GET',
+                expect.objectContaining({ qty: 1, baseUrl: 'https://store.example.com/es' }),
+                expect.any(Function),
+            );
+        });
+
+        test('requestOptions.baseUrl wins when first arg also has baseUrl', () => {
+            const callback = jest.fn();
+
+            productAttributes.configureInCart(
+                'item-abc',
+                { template: 'cart/modals/configure-product', baseUrl: 'https://wrong.example.com' },
+                callback,
+                { baseUrl: 'https://store.example.com/es' },
+            );
+
+            const [, , passedOptions] = productAttributes.remoteRequest.mock.calls[0];
+            expect(passedOptions.baseUrl).toBe('https://store.example.com/es');
+            expect(passedOptions.template).toBe('cart/modals/configure-product');
+        });
+    });
+});
diff --git a/src/api/cart.js b/src/api/cart.js
index d0b18a9..34cec6d 100644
--- a/src/api/cart.js
+++ b/src/api/cart.js
@@ -293,19 +293,25 @@ export default class extends Base {
      * @param {Object} params
      * @param {String|Array|Object} renderWith
      * @param {Function} callback
+     * @param {Object} [requestOptions]
      */
-    getShippingQuotes(params, renderWith, callback) {
-        const options = {
-            params,
-        };
+    getShippingQuotes(params, renderWith, callback, requestOptions = {}) {
         let callbackArg = callback;
         let renderWithArg = renderWith;
+        let requestOptionsArg = requestOptions;
 
         if (typeof callbackArg !== 'function') {
+            // renderWith was omitted — shift remaining args: callback → requestOptions
+            requestOptionsArg = callbackArg || {};
             callbackArg = renderWithArg;
             renderWithArg = null;
         }
 
+        const options = {
+            ...requestOptionsArg,
+            params,
+        };
+
         if (renderWithArg) {
             options.template = renderWithArg;
         }
diff --git a/src/api/product-attributes.js b/src/api/product-attributes.js
index a4cc122..37f951c 100644
--- a/src/api/product-attributes.js
+++ b/src/api/product-attributes.js
@@ -18,18 +18,23 @@ export default class extends Base {
     /**
      * @param {Number} productId
      * @param {Object} params
-     * @param callback
+     * @param {String|null} [template]
+     * @param {Function} callback
+     * @param {Object} [requestOptions]
      */
-    optionChange(productId, params, template = null, callback) {
+    optionChange(productId, params, template = null, callback, requestOptions = {}) {
         let templateArg = template;
         let callbackArg = callback;
+        let requestOptionsArg = requestOptions;
 
         if (typeof templateArg === 'function') {
+            // template was omitted — shift remaining args: callback → requestOptions
+            requestOptionsArg = callbackArg || {};
             callbackArg = templateArg;
             templateArg = null;
         }
 
-        this.remoteRequest(this.endpoint + productId, 'POST', { params: parse(params), template: templateArg }, (err, response) => {
+        this.remoteRequest(this.endpoint + productId, 'POST', { ...requestOptionsArg, params: parse(params), template: templateArg }, (err, response) => {
             const emitData = {
                 err,
                 response,
@@ -43,10 +48,11 @@ export default class extends Base {
     /**
      * @param {Number} itemId
      * @param {Object} params
-     * @param callback
+     * @param {Function} callback
+     * @param {Object} [requestOptions]
      */
-    configureInCart(itemId, params, callback) {
-        this.remoteRequest(this.inCartEndpoint + itemId, 'GET', params, (err, response) => {
+    configureInCart(itemId, params, callback, requestOptions = {}) {
+        this.remoteRequest(this.inCartEndpoint + itemId, 'GET', { ...params, ...requestOptions }, (err, response) => {
             callback(err, response);
         });
     }