先决条件：Facebook Login for Business 需要 public_profile高级访问权限，请到 Meta App Dashboard > App Review > Permissions and Features 申请。
接着请 依次完成以下步骤：
完整网页代码示例如下：
<html>
<head>
<meta charset="utf-8"/>
<script>
window.fbAsyncInit = function () {
// JavaScript SDK configuration and setup
FB.init({
appId: '{YOUR-FACEBOOK-APP-ID}', // Facebook App ID
cookie: true, // enable cookies
xfbml: true, // parse social plugins on this page
version: 'v18.0' //Graph API version
});
};
// Load the JavaScript SDK asynchronously
(function (d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) {
return;
}
js = d.createElement(s);
js.id = id;
js.src = "https://connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
// Facebook Login with JavaScript SDK
function launchWhatsAppSignup() {
// Launch Facebook login
FB.login(function (response) {
if (response.authResponse) {
const code = response.authResponse.code;
console.log('User authResponse code:', code);
// The returned code must be transmitted to your backend,
// which will perform a server-to-server call from there to our servers for an access token
} else {
console.log('User cancelled login or did not fully authorize.');
}
}, {
config_id: '{YOUR-CONFIGURATION-ID}',
response_type: 'code', // must be set to 'code' for System User access token
override_default_response_type: true, // when true, any response types passed in the "response_type" will take precedence over the default types
extras: {
sessionInfoVersion: 3,
setup: {
solutionID: '{YOUR-SOLUTION-ID}'
}
},
});
}
const sessionInfoListener = (event) => {
if (event.origin == null) {
return;
}
// Make sure the data is coming from facebook.com
if (!event.origin.endsWith("facebook.com")) {
return;
}
try {
const data = JSON.parse(event.data);
if (data.type === 'WA_EMBEDDED_SIGNUP') {
// if user finishes the Embedded Signup flow
if (data.event === 'FINISH') {
const {phone_number_id, waba_id} = data.data;
console.log("Phone number ID ", phone_number_id, " WhatsApp business account ID ", waba_id);
}
// if user reports an error during the Embedded Signup flow
else if (data.event === 'ERROR') {
const {error_message} = data.data;
console.error("error ", error_message);
}
// if user cancels the Embedded Signup flow
else {
const {current_step} = data.data;
console.warn("Cancel at ", current_step);
}
}
} catch {
// Don’t parse info that’s not a JSON
console.log('Non JSON Response', event.data);
}
};
window.addEventListener('message', sessionInfoListener);
</script>
</head>
<body>
<button onclick="launchWhatsAppSignup()"
style="background-color: #1877f2; border: 0; border-radius: 4px; color: #fff; cursor: pointer; font-family: Helvetica, Arial, sans-serif; font-size: 16px; font-weight: bold; height: 40px; padding: 0 24px;">
Launch Embedded Signup
</button>
</body>
</html>
