Keyword: WeChat Message API Text Image Location Link Event Music RichMedia
Author: PondBay Studio[WeChat Developer EXPERT]
Address: http://www.cnblogs.com/txw1958/p/WeChat-Message-API.html
Guide for Message API
Introduction
The WeChat Official Account Admin Platform provides developers with a Message API to manage incoming messages and reply logic.
Apply for Message API
Click Apply and fill in a name, phone and email for a contact person, as well as a URL pointing to your server and a token. The token is used to generate a signature for communication between your app and WeChat.
URL Access
When the application is submitted, a GET request will be sent to the URL provided above with the 4 parameters below:
| Parameter | Description |
|---|---|
| signature | signature for communication encryption |
| timestamp | time stamp |
| nonce | a random number |
| echostr | a random string |
You should check whether the HTTP request is from WeChat by verifying the signature. If the signature is correct, you should return the echostr.
The signature will be generated in the following way using the token (that you provided), timestamp and nonce.
1. Sort the 3 values of token, timestamp and nonce alphabetically. 2. Combine the 3 parameters into one string, encrypt it using SHA-1. 3. Compare the SHA-1 digest string with the signature from the request. If they are the same, the access request is from WeChat.
Pushing Messages
When a WeChat user sends a message to an Official Account, WeChat Official Account Admin Platform will POST it to you via the URL you provided.
Text messages
<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[fromUser]]></FromUserName> <CreateTime>1348831860</CreateTime> <MsgType><![CDATA[text]]></MsgType> <Content><![CDATA[this is a test]]></Content> <MsgId>1234567890123456</MsgId> </xml>
| Parameter | Description |
|---|---|
| ToUserName | WeChat ID of your app |
| FromUserName | a unique ID for the sender |
| CreateTime | create time of the message |
| MsgType | message type ("text" for text messages) |
| Content | message contents |
| MsgId | a unique ID for the message (64 bit integer) |
Image messages
<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[fromUser]]></FromUserName> <CreateTime>1348831860</CreateTime> <MsgType><![CDATA[image]]></MsgType> <PicUrl><![CDATA[this is a url]></PicUrl> <MsgId>1234567890123456</MsgId> </xml>
| Parameter | Description |
|---|---|
| ToUserName | WeChat ID of your app |
| FromUserName | a unique ID for the sender |
| CreateTime | create time of the message |
| MsgType | message type ("image" for image messages) |
| PicUrl | URL for the image |
| MsgId | a unique ID for the message (64 bit integer) |
Location data messages
<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[fromUser]]></FromUserName> <CreateTime>1351776360</CreateTime> <MsgType><![CDATA[location]]></MsgType> <Location_X>23.134521</Location_X> <Location_Y>113.358803</Location_Y> <Scale>20</Scale> <Label><![CDATA[location]]></Label> <MsgId>1234567890123456</MsgId> </xml>
| Parameter | Description |
|---|---|
| ToUserName | WeChat ID of your app |
| FromUserName | a unique ID for the sender |
| CreateTime | create time of the message |
| MsgType | message type ("location" for location messages) |
| Location_X | latitude of the location |
| Location_Y | longitude of the location |
| Scale | scale of the map |
| Label | location description |
| MsgId | a unique ID for the message (64 bit integer) |
Link messages
<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[fromUser]]></FromUserName> <CreateTime>1357290913</CreateTime> <MsgType><![CDATA[link]]></MsgType> <Title><![CDATA[WeChat Official Account Platform portal]]></Title> <Description><![CDATA[The URL of the portal]]></Description> <Url><![CDATA[url]]></Url> <MsgId>1234567890123456</MsgId> </xml>
| Parameter | Description |
|---|---|
| ToUserName | WeChat ID of your app |
| FromUserName | a unique ID for the sender |
| CreateTime | create time of the message |
| MsgType | message type ("link" for link messages) |
| Title | title of the message |
| Description | description of the message |
| Url | url which is sent to users |
| MsgId | a unique ID for the message (64 bit integer) |
Event messages
<xml><ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[FromUser]]></FromUserName> <CreateTime>123456789</CreateTime> <MsgType><![CDATA[event]]></MsgType> <Event><![CDATA[EVENT]]></Event> <EventKey><![CDATA[EVENTKEY]]></EventKey> </xml>
| Parameter | Description |
|---|---|
| ToUserName | WeChat ID of your app |
| FromUserName | a unique ID for the sender |
| CreateTime | create time of the message |
| MsgType | message type ("event" for event messages) |
| Event | event type, currently we have 3 types: subscribe, unsubscribe, CLICK(coming soon) |
| EventKey | for future usage |
Messages Replies
You can reply to incoming messages. Now the platform supports different kinds of messages, including text, image, voice, video and music. You can also do the operation 'add to my favorites'.
If you fail to perform your response within 5 seconds, we will close the connection.
The data structure for a reply message:
Text messages
<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[fromUser]]></FromUserName> <CreateTime>12345678</CreateTime> <MsgType><![CDATA[text]]></MsgType> <Content><![CDATA[content]]></Content> <FuncFlag>0</FuncFlag> </xml>
| Parameter | Description |
|---|---|
| ToUserName | a unique ID for the receiver, you can get it from the request |
| FromUserName | WeChat ID of your app |
| CreateTime | create time of the message, the type is integer |
| MsgType | message type ("text" for text messages) |
| Content | reply message contents |
| FuncFlag | add a star for the message if the bit (0x0001) is set |
Music message
<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[fromUser]]></FromUserName> <CreateTime>12345678</CreateTime> <MsgType><![CDATA[music]]></MsgType> <Music> <Title><![CDATA[TITLE]]></Title> <Description><![CDATA[DESCRIPTION]]></Description> <MusicUrl><![CDATA[MUSIC_Url]]></MusicUrl> <HQMusicUrl><![CDATA[HQ_MUSIC_Url]]></HQMusicUrl> <ThumbMediaId><![CDATA[media_id]]></ThumbMediaId> </Music> <FuncFlag>0</FuncFlag> </xml>
| Parameter | Description |
|---|---|
| ToUserName | a unique ID for the receiver, you can get it from the request |
| FromUserName | WeChat ID of your app |
| CreateTime | create time of the message, the type is integer |
| MsgType | message type("music" for music messages) |
| MusicUrl | URL for the music |
| HQMusicUrl | URL for high quality, WeChat will access it when using WiFi |
| ThumbMediaId | OPTIONAL. You will get this ID after you upload the thumb (80*80) by using the API |
| FuncFlag | add a star for the message if the bit (0x0001) is set |
Rich media messages
<xml> <ToUserName><![CDATA[toUser]]></ToUserName> <FromUserName><![CDATA[fromUser]]></FromUserName> <CreateTime>12345678</CreateTime> <MsgType><![CDATA[news]]></MsgType> <ArticleCount>2</ArticleCount> <Articles> <item> <Title><![CDATA[title1]]></Title> <Description><![CDATA[description1]]></Description> <PicUrl><![CDATA[picurl]]></PicUrl> <Url><![CDATA[url]]></Url> </item> <item> <Title><![CDATA[title]]></Title> <Description><![CDATA[description]]></Description> <PicUrl><![CDATA[picurl]]></PicUrl> <Url><![CDATA[url]]></Url> </item> </Articles> <FuncFlag>1</FuncFlag> </xml>
| Parameter | Description |
|---|---|
| ToUserName | a unique ID for the receiver, you can get it from the request |
| FromUserName | WeChat ID of your app |
| CreateTime | create time of the message, the type is integer |
| MsgType | message type ("news" for rich media messages) |
| ArticleCount | quantity of rich media messages (no larger than 10) |
| Articles | contents of rich media messages. The first item will be displayed in large image by default. |
| Title | title of the rich media message |
| Description | description of the rich media message |
| PicUrl | URL of images in the rich media message. Domain name of this URL should be the same as the one of URL provided in basic info. Recommended image size: 640*320 (large image); 80*80 (small image) |
| Url | redirection link of the rich media message |
Notes
1. One user's unique ID is different for different Official Accounts.
2. Recommend you use port 80 for your app server.
Sample code
PHP：Download
PondBay Studio is the Expert of WeChat Development, and has a lots of cases in China, Japan, Europe and US. The Founder has served the top companies such as China HuaWei and Israel Company. You can Contact US via email 
