How to implement WeChat card and coupon cancellation interface in PHP

With the vigorous development of the e-commerce industry, more and more companies are beginning to understand and use the WeChat card and coupon function. In order to better interact with users, the use of the WeChat card and coupon verification interface has become indispensable. link. This article will introduce how to implement the WeChat card and coupon verification interface in PHP.

1. Development preparation
1. WeChat public platform account
2.PHP development environment
3.WeChat official document

2. WeChat card and coupon interface authentication
1. Obtain access_token
In order to use the WeChat card and coupon interface, you first need to obtain the access_token, which is the only ticket when calling the WeChat card and coupon interface. The acquisition method is as follows:

function get_access_token($appid,$appsecret){  
    $url="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$appsecret";  
    $arr = https_request($url);  
    $json = json_decode($arr,true);  
    return $json["access_token"];  
}  

2. Create card and coupon signature
When using the WeChat card and coupon interface, you need to sign and encrypt the request parameters and access_token. The method is as follows:

function getSignature($param,$access_token){  
    
    $paramArray=$param;  
    array_push($paramArray,$access_token);  
    sort($paramArray,SORT_STRING);  
    $string1=implode($paramArray);  
    $signature=sha1($string1);  
    
    return $signature;  
}  

3. Core Card cancellation coupon
1. Scan code operation
The user opens WeChat and scans the merchant's store QR code. The store QR code link contains the scene value passed to the merchant. The merchant uses this scene value to obtain the card and coupon code information corresponding to the user through the WeChat interface, and performs a write-off operation.

2. Write-off interface call
The parameters that need to be passed when calling the write-off interface are:
1.access_token
2.code
3.card_id

function consumeCard($card_id,$code,$access_token){  
    $url="https://api.weixin.qq.com/card/code/consume?access_token=$access_token";  
    $param['code']=$code;  
    $param['card_id']=$card_id;  
    $param['check_consume']=true;  
    $jsonParam=json_encode($param);  
    $result=https_request($url,$jsonParam);  
    $result=json_decode($result,true);  
    if($result['errcode']==0){  
        $card_info=$result;  
        $card_info['page_url']=$xiaojin_url."/";//核销成功后，前台跳转页面  
        return $card_info;  
    }else{  
        return FALSE;  
    }  
}  

4. Summary
This article briefly introduces how to implement the WeChat card and coupon verification interface in PHP. In actual development, it is also necessary to consider the use of interfaces such as querying card and coupon information and sending template messages. In addition, we also need to pay attention to the security of request parameters when calling the WeChat interface to avoid leaking merchant and user information.

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