diff --git a/recharge/create.html b/recharge/create.html
index 8ec19dc..e7a8f87 100644
--- a/recharge/create.html
+++ b/recharge/create.html
@@ -249,6 +249,14 @@
                     <h2>创建支付链接</h2>
                     <form id="createForm">
                         <div class="form-grid">
+                            <div class="field full">
+                                <label for="appCode">App</label>
+                                <select id="appCode">
+                                    <option value="lalu">lalu</option>
+                                    <option value="yumi">yumi</option>
+                                    <option value="aslan">aslan</option>
+                                </select>
+                            </div>
                             <div class="field full">
                                 <label for="paymentMethod">支付方式</label>
                                 <select id="paymentMethod" required>
@@ -284,7 +292,7 @@
                                 <label for="returnUrl">支付完成返回地址</label>
                                 <input
                                     id="returnUrl"
-                                    placeholder="不填则返回当前页面"
+                                    placeholder="默认按选择的 App 返回充值页"
                                     type="url"
                                 />
                             </div>
@@ -357,13 +365,17 @@
             </section>
         </main>
 
-        <script src="../common/api.js"></script>
         <script>
             (function () {
+                var API_BASE_URL = 'https://api.global-interaction.com/';
+                var RETURN_URL_BASE =
+                    'https://h5.global-interaction.com/recharge/index.html';
                 var methods = [];
                 var latestPaymentLink = '';
                 var latestOrderID = '';
+                var returnUrlTouched = false;
                 var els = {
+                    appCode: document.getElementById('appCode'),
                     coinAmount: document.getElementById('coinAmount'),
                     copyLink: document.getElementById('copyLink'),
                     createButton: document.getElementById('createButton'),
@@ -382,11 +394,16 @@
                     verifyResult: document.getElementById('verifyResult'),
                 };
 
-                els.envMeta.textContent =
-                    'App：' +
-                    window.HyAppAPI.getAppCode() +
-                    ' ｜ API：' +
-                    window.HyAppAPI.baseURL();
+                setDefaultReturnURL(true);
+                renderEnvMeta();
+                els.appCode.addEventListener('change', function () {
+                    setDefaultReturnURL(false);
+                    renderEnvMeta();
+                    loadMethods();
+                });
+                els.returnUrl.addEventListener('input', function () {
+                    returnUrlTouched = true;
+                });
                 els.createForm.addEventListener('submit', createPaymentLink);
                 els.reloadMethods.addEventListener('click', loadMethods);
                 els.copyLink.addEventListener('click', function () {
@@ -406,9 +423,7 @@
                 function loadMethods() {
                     setMessage(els.createMessage, '正在加载支付方式...', '');
                     els.paymentMethod.disabled = true;
-                    return window.HyAppAPI.get(
-                        '/api/v1/recharge/h5/temporary/methods'
-                    )
+                    return apiGet('/api/v1/recharge/h5/temporary/methods')
                         .then(function (data) {
                             methods = Array.isArray(data.methods)
                                 ? data.methods
@@ -484,18 +499,13 @@
                     }
                     setLoading(els.createButton, true, '创建中...');
                     setMessage(els.createMessage, '正在创建支付链接...', '');
-                    window.HyAppAPI.post(
-                        '/api/v1/recharge/h5/temporary/orders',
-                        {
-                            coin_amount: coinAmount,
-                            usd_minor_amount: usdMinorAmount,
-                            provider_code: method.provider_code,
-                            payment_method_id: method.method_id,
-                            return_url:
-                                els.returnUrl.value.trim() ||
-                                window.location.href,
-                        }
-                    )
+                    apiPost('/api/v1/recharge/h5/temporary/orders', {
+                        coin_amount: coinAmount,
+                        usd_minor_amount: usdMinorAmount,
+                        provider_code: method.provider_code,
+                        payment_method_id: method.method_id,
+                        return_url: currentReturnURL(),
+                    })
                         .then(function (data) {
                             latestPaymentLink = data.payment_link || '';
                             latestOrderID =
@@ -541,7 +551,7 @@
                         '正在向后端查询支付状态...',
                         ''
                     );
-                    window.HyAppAPI.get(
+                    apiGet(
                         '/api/v1/recharge/h5/temporary/orders/' +
                             encodeURIComponent(orderID)
                     )
@@ -571,7 +581,7 @@
                     var order = data.order || {};
                     var paymentLink = data.payment_link || order.pay_url || '';
                     target.innerHTML = [
-                        resultRow('订单号', order.order_id || '-'),
+                        resultRow('订单ID', order.order_id || '-'),
                         resultRow(
                             '支付状态',
                             '<span class="status ' +
@@ -638,6 +648,153 @@
                     });
                 }
 
+                function apiGet(path) {
+                    return apiRequest(path, { method: 'GET' });
+                }
+
+                function apiPost(path, body) {
+                    return apiRequest(path, {
+                        method: 'POST',
+                        body: body || {},
+                    });
+                }
+
+                function apiRequest(path, options) {
+                    var opts = options || {};
+                    var headers = {
+                        'X-App-Code': currentAppCode(),
+                    };
+                    var body;
+                    if (opts.body) {
+                        headers['Content-Type'] = 'application/json';
+                        body = JSON.stringify(opts.body);
+                    }
+                    return fetch(apiURL(path), {
+                        method: opts.method || 'GET',
+                        headers: headers,
+                        body: body,
+                        credentials: 'omit',
+                    }).then(function (response) {
+                        return response.text().then(function (text) {
+                            var payload = parsePayload(text);
+                            if (!response.ok) {
+                                var error = new Error(
+                                    errorMessage(response, payload, text)
+                                );
+                                error.status = response.status;
+                                error.payload = payload;
+                                throw error;
+                            }
+                            if (isAPIFailure(payload)) {
+                                throw new Error(
+                                    payload.message ||
+                                        payload.errorMsg ||
+                                        payload.error ||
+                                        '接口请求失败'
+                                );
+                            }
+                            return Object.prototype.hasOwnProperty.call(
+                                payload,
+                                'data'
+                            )
+                                ? payload.data
+                                : payload;
+                        });
+                    });
+                }
+
+                function apiURL(path) {
+                    return new URL(
+                        path.replace(/^\/+/, ''),
+                        API_BASE_URL
+                    ).toString();
+                }
+
+                function parsePayload(text) {
+                    if (!text) return {};
+                    try {
+                        return JSON.parse(text);
+                    } catch (_) {
+                        return { message: text };
+                    }
+                }
+
+                function errorMessage(response, payload, text) {
+                    if (response.status === 404) {
+                        return '接口不存在或后端还没有部署到线上';
+                    }
+                    return (
+                        payload.message ||
+                        payload.errorMsg ||
+                        payload.error ||
+                        text ||
+                        response.statusText ||
+                        '接口请求失败'
+                    );
+                }
+
+                function isAPIFailure(payload) {
+                    var code = payload && payload.code;
+                    var errorCode = payload && payload.errorCode;
+                    return (
+                        (typeof code === 'number' && code !== 0) ||
+                        (typeof code === 'string' &&
+                            code !== '' &&
+                            code !== 'OK') ||
+                        (typeof errorCode === 'number' && errorCode !== 0) ||
+                        (typeof errorCode === 'string' &&
+                            errorCode !== '' &&
+                            errorCode !== '0' &&
+                            errorCode !== 'OK')
+                    );
+                }
+
+                function currentAppCode() {
+                    var value = String(els.appCode.value || 'lalu')
+                        .trim()
+                        .toLowerCase();
+                    return value === 'yumi' || value === 'aslan'
+                        ? value
+                        : 'lalu';
+                }
+
+                function currentReturnURL() {
+                    return (
+                        els.returnUrl.value.trim() ||
+                        defaultReturnURL(currentAppCode())
+                    );
+                }
+
+                function defaultReturnURL(appCode) {
+                    var url = new URL(RETURN_URL_BASE);
+                    url.searchParams.set('app_code', appCode || 'lalu');
+                    return url.toString();
+                }
+
+                function setDefaultReturnURL(force) {
+                    var nextURL = defaultReturnURL(currentAppCode());
+                    if (
+                        force ||
+                        !returnUrlTouched ||
+                        isKnownDefaultReturnURL(els.returnUrl.value)
+                    ) {
+                        els.returnUrl.value = nextURL;
+                        returnUrlTouched = false;
+                    }
+                }
+
+                function isKnownDefaultReturnURL(value) {
+                    var text = String(value || '').trim();
+                    return ['lalu', 'yumi', 'aslan'].some(function (appCode) {
+                        return text === defaultReturnURL(appCode);
+                    });
+                }
+
+                function renderEnvMeta() {
+                    els.envMeta.textContent =
+                        'App：' + currentAppCode() + ' ｜ API：' + API_BASE_URL;
+                }
+
                 function dollarsToMinor(value) {
                     var text = String(value || '').trim();
                     if (!/^\d+(\.\d{1,2})?$/.test(text)) return 0;