Pre-development configuration
Before accessing the code, you must fill in the authorization callback domain name in the WeChat background. This domain name must be registered with ICP.
Main development process
- Select WeChat Pay when placing an order
- The merchant performs business logic processing and calls WeChat to unify the single interface. The WeChat H5 transaction type is: trade_type=MWEB
- When the ordering interface is successfully called, WeChat will return related parameters including payment jump URL and other related parameters. The merchant will adjust the payment intermediate page through the parameter mweb_url.
- WeChat will perform H5 permission verification on the middle page
- Payment is successful, WeChat will send an asynchronous result notification to the merchant
Formal development
Modify WeChat Pay and only specify the necessary parameters
Request WeChat to unify a single interface, interface address:/pay/unifiedorder
Interface request parameters
- appid: WeChat official account iD
- mch_id: Account number
- nonce_str: Random string, not longer than 32 bits
- sign: Signature
- body: product description
- out_trade_no: Merchant order number, not longer than 32 digits
- total_fee: total amount, in units of division
- spbill_create_ip: IP when the user requests payment
- notify_url: Asynchronous notification callback address, must be a direct access address, and cannot carry parameters
- trade_type: transaction type, such as H5, it is MWEB
The above are the parameters required for H5 payment and order
Signature generation
- The parameters participating in the generation of the signature must be non-empty
- Parameters are sorted from small to large according to ASCII code, and parameter names are case sensitive
- According to the above rules, splice the parameters into strings such as k1=v1&k2=v2..
- Splice the string obtained in the previous step on the key, such as k1=v1&k2=v2&key=192006250b4c09247ec02e
- Then MD5 encrypt the last string and convert it to capitalization, which is the final sign value
Code:
/**
* Signature formation
* @param array $params Request parameters
* @param string $key key
*/
public function genSign($params, $key)
{
foreach ($params as $k=>$v) {
if (!$v) {
unset($params[$k]);
}
}
ksort($params);
$paramStr = '';
foreach ($params as $k => $v) {
$paramStr = $paramStr . $k . '=' . $v . '&';
}
$paramStr = $paramStr . 'key='.$key;
$sign = strtoupper(md5($paramStr));
return $sign;
}
Make a request
Convert the parameters to XML data to initiate a request
Convert an array to XML code:
/**
* Convert array to XML
* @param array $params Payment request parameters
*/
public function array_to_xml($params)
{
if(!is_array($params)|| count($params) <= 0) {
return false;
}
$xml = "<xml>";
foreach ($params as $key=>$val) {
if (is_numeric($val)) {
$xml.="<".$key.">".$val."</".$key.">";
} else {
$xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
}
}
$xml.="</xml>";
return $xml;
}
Request code:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
$return = curl_exec($ch);
curl_close($ch);
return $return;
WeChat returns XML data:
<xml><return_code><![CDATA[SUCCESS]]></return_code> <return_msg><![CDATA[OK]]></return_msg> <appid><![CDATA[wxdded766660f9b840]]></appid> <mch_id><![CDATA[1516216351]]></mch_id> <device_info><![CDATA[100]]></device_info> <nonce_str><![CDATA[2DUN2i2pGnlC6vDi]]></nonce_str> <sign><![CDATA[95CEA831D598299097A32D8FEEC6BDEF]]></sign> <result_code><![CDATA[SUCCESS]]></result_code> <prepay_id><![CDATA[wx22194530678545eb3713f2f10724143329]]></prepay_id> <trade_type><![CDATA[MWEB]]></trade_type> <mweb_url><![CDATA[/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx22194530678545eb3713f2f10724143329&package=87106983]]></mweb_url>
return_code is SUCCESS that means the payment request is successful;
mweb_url is a payment redirect page. At this time, the client can already adjust WeChat payment through mweb_url
Intermediate page processing
After obtaining the mweb_url parameter returned by WeChat, deepLink can be further obtained on the server side
Code:
/**
* Get the deepLink parameters on the WeChat payment middle page
* @param string $url mweb_url returned by WeChat
* @param string $ip User IP
*/
public function getDeeplink(string $url, string $ip)
{
$headers = array("X-FORWARDED-FOR:$ip", "CLIENT-IP:$ip");
ob_start();
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_HTTPHEADER , $headers );
curl_setopt ($ch, CURLOPT_REFERER, "pay.");
curl_setopt( $ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Linux; Android 6.0.1; OPPO R11s Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36');
curl_exec($ch);
curl_close ($ch);
$out = ob_get_contents();
ob_clean();
$a = preg_match('/weixin:\/\/wap.*/',$out, $str);
if ($a) {
return substr($str[0], 0, strlen($str[0])-1);
} else {
return '';
}
}
weixin://wap/pay?prepayid%3Dwx22201221074146ac747121890095299503&package=2656135616&noncestr=1542888966&sign=e31dbc2d1231708ff8a982b15a6c7646 is the obtained deepLink value, and the client can also directly adjust the payment through this value
The above is all the content of this article. I hope it will be helpful to everyone's study and I hope everyone will support me more.