问题
Below is code in PHP for PayU Payment gateway integration. Payment Gateway is opened via a Post form submit and form action is url https://sandboxsecure.payu.in
Using Webview we can redirect to https://sandboxsecure.payu.in. but need to send the data as well.
Can we create similar flow in flutter web? Possible flow
Flutter Web --- > Submit form and open webview to show PayU Page --> After payment come back to flutter web
note - Hash generation will be done via third party API.
<?php
$MERCHANT_KEY = "";
$SALT = "";
// Merchant Key and Salt as provided by Payu.
$PAYU_BASE_URL = "https://sandboxsecure.payu.in"; // For Sandbox Mode
//$PAYU_BASE_URL = "https://secure.payu.in"; // For Production Mode
$action = '';
$posted = array();
if(!empty($_POST)) {
//print_r($_POST);
foreach($_POST as $key => $value) {
$posted[$key] = $value;
}
}
$formError = 0;
if(empty($posted['txnid'])) {
// Generate random transaction id
$txnid = substr(hash('sha256', mt_rand() . microtime()), 0, 20);
} else {
$txnid = $posted['txnid'];
}
$hash = '';
// Hash Sequence
$hashSequence = "key|txnid|amount|productinfo|firstname|email|udf1|udf2|udf3|udf4|udf5|udf6|udf7|udf8|udf9|udf10";
if(empty($posted['hash']) && sizeof($posted) > 0) {
if(
empty($posted['key'])
|| empty($posted['txnid'])
|| empty($posted['amount'])
|| empty($posted['firstname'])
|| empty($posted['email'])
|| empty($posted['phone'])
|| empty($posted['productinfo'])
|| empty($posted['surl'])
|| empty($posted['furl'])
|| empty($posted['service_provider'])
) {
$formError = 1;
} else {
//$posted['productinfo'] = json_encode(json_decode('[{"name":"tutionfee","description":"","value":"500","isRequired":"false"},{"name":"developmentfee","description":"monthly tution fee","value":"1500","isRequired":"false"}]'));
$hashVarsSeq = explode('|', $hashSequence);
$hash_string = '';
foreach($hashVarsSeq as $hash_var) {
$hash_string .= isset($posted[$hash_var]) ? $posted[$hash_var] : '';
$hash_string .= '|';
}
$hash_string .= $SALT;
$hash = strtolower(hash('sha512', $hash_string));
$action = $PAYU_BASE_URL . '/_payment';
}
} elseif(!empty($posted['hash'])) {
$hash = $posted['hash'];
$action = $PAYU_BASE_URL . '/_payment';
}
?>
<html>
<head>
<script>
var hash = '<?php echo $hash ?>';
function submitPayuForm() {
if(hash == '') {
return;
}
var payuForm = document.forms.payuForm;
payuForm.submit();
}
</script>
</head>
<body onload="submitPayuForm()">
<h2>PayU Form</h2>
<br/>
<?php if($formError) { ?>
<span style="color:red">Please fill all mandatory fields.</span>
<br/>
<br/>
<?php } ?>
<form action="<?php echo $action; ?>" method="post" name="payuForm">
<input type="hidden" name="key" value="<?php echo $MERCHANT_KEY ?>" />
<input type="hidden" name="hash" value="<?php echo $hash ?>"/>
<input type="hidden" name="txnid" value="<?php echo $txnid ?>" />
<table>
<tr>
<td><b>Mandatory Parameters</b></td>
</tr>
<tr>
<td>Amount: </td>
<td><input name="amount" value="<?php echo (empty($posted['amount'])) ? '' : $posted['amount'] ?>" /></td>
<td>First Name: </td>
<td><input name="firstname" id="firstname" value="<?php echo (empty($posted['firstname'])) ? '' : $posted['firstname']; ?>" /></td>
</tr>
<tr>
<td>Email: </td>
<td><input name="email" id="email" value="<?php echo (empty($posted['email'])) ? '' : $posted['email']; ?>" /></td>
<td>Phone: </td>
<td><input name="phone" value="<?php echo (empty($posted['phone'])) ? '' : $posted['phone']; ?>" /></td>
</tr>
<tr>
<td>Product Info: </td>
<td colspan="3"><textarea name="productinfo"><?php echo (empty($posted['productinfo'])) ? '' : $posted['productinfo'] ?></textarea></td>
</tr>
<tr>
<td>Success URI: </td>
<td colspan="3"><input name="surl" value="<?php echo (empty($posted['surl'])) ? '' : $posted['surl'] ?>" size="64" /></td>
</tr>
<tr>
<td>Failure URI: </td>
<td colspan="3"><input name="furl" value="<?php echo (empty($posted['furl'])) ? '' : $posted['furl'] ?>" size="64" /></td>
</tr>
<tr>
<td colspan="3"><input type="hidden" name="service_provider" value="payu_paisa" size="64" /></td>
</tr>
<tr>
<td><b>Optional Parameters</b></td>
</tr>
<tr>
<td>Last Name: </td>
<td><input name="lastname" id="lastname" value="<?php echo (empty($posted['lastname'])) ? '' : $posted['lastname']; ?>" /></td>
<td>Cancel URI: </td>
<td><input name="curl" value="" /></td>
</tr>
<tr>
<td>Address1: </td>
<td><input name="address1" value="<?php echo (empty($posted['address1'])) ? '' : $posted['address1']; ?>" /></td>
<td>Address2: </td>
<td><input name="address2" value="<?php echo (empty($posted['address2'])) ? '' : $posted['address2']; ?>" /></td>
</tr>
<tr>
<td>City: </td>
<td><input name="city" value="<?php echo (empty($posted['city'])) ? '' : $posted['city']; ?>" /></td>
<td>State: </td>
<td><input name="state" value="<?php echo (empty($posted['state'])) ? '' : $posted['state']; ?>" /></td>
</tr>
<tr>
<td>Country: </td>
<td><input name="country" value="<?php echo (empty($posted['country'])) ? '' : $posted['country']; ?>" /></td>
<td>Zipcode: </td>
<td><input name="zipcode" value="<?php echo (empty($posted['zipcode'])) ? '' : $posted['zipcode']; ?>" /></td>
</tr>
<tr>
<td>UDF1: </td>
<td><input name="udf1" value="<?php echo (empty($posted['udf1'])) ? '' : $posted['udf1']; ?>" /></td>
<td>UDF2: </td>
<td><input name="udf2" value="<?php echo (empty($posted['udf2'])) ? '' : $posted['udf2']; ?>" /></td>
</tr>
<tr>
<td>UDF3: </td>
<td><input name="udf3" value="<?php echo (empty($posted['udf3'])) ? '' : $posted['udf3']; ?>" /></td>
<td>UDF4: </td>
<td><input name="udf4" value="<?php echo (empty($posted['udf4'])) ? '' : $posted['udf4']; ?>" /></td>
</tr>
<tr>
<td>UDF5: </td>
<td><input name="udf5" value="<?php echo (empty($posted['udf5'])) ? '' : $posted['udf5']; ?>" /></td>
<td>PG: </td>
<td><input name="pg" value="<?php echo (empty($posted['pg'])) ? '' : $posted['pg']; ?>" /></td>
</tr>
<tr>
<?php if(!$hash) { ?>
<td colspan="4"><input type="submit" value="Submit" /></td>
<?php } ?>
</tr>
</table>
</form>
</body>
</html>
来源：https://stackoverflow.com/questions/60388607/flutter-webview-form-post