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I am developing Blog website and i have used the custom paypal button, but now i want to send confirmation email after payment made via paypal.

I had searched for IPN's API but don't know how to integrate with WordPress. So, can you anyone please help me to do this or any quick solution for that ?

<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input name="cmd" type="hidden" value="_s-xclick" />

enter image description here

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    What event or hook is triggered after a successful payment? And can you post the code you're using to trigger the button? – jgraup Feb 28 '16 at 2:59
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    @jgraup edited question – bishal neupane Feb 28 '16 at 3:25
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    I'd imagine, looking at your submit button, that when you click the button you are taken to the PayPal site. Is there a redirect back to your site? Because you could put a value in the url and detect that from WP for your email trigger. – jgraup Feb 28 '16 at 3:27
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    Yes, have put the cancel url and redirect url into our site – bishal neupane Feb 28 '16 at 3:28
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    So what is the redirect url that it goes to on success? – jgraup Feb 28 '16 at 3:30
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To send an email, check out wp_mail(); For example:

$to = 'sendto@example.com';
$subject = 'The subject';
$body = 'The email body content';
$headers = array('Content-Type: text/html; charset=UTF-8');

wp_mail( $to, $subject, $body, $headers );

As for when a confirmation is made, it might be best to customize the return url on the form - see setting the return url on individual transactions. If you can redirect to a custom page, then that is much easier to detect.

You still have to work out how much information about the transaction can you pass in the url that will give you enough information once the url returns. It might be easily accomplished by setting information using the transient API and checking for that key in the success page template.

Here is a page template for testing. You can make a page and set it to this page template in order to test how parts might work:

<?php

/**
 * Template Name: PayPal Template Page
 *
 * @package    WordPress
 * @subpackage Twenty_Sixteen
 * @since      Twenty Sixteen 1.0
 */

get_header(); ?>

<div id="primary" class="content-area">
    <main id="main" class="site-main" role="main">
        <?php
        // Start the loop.
        while( have_posts() ) : the_post();

            // check the page action and define nonce ahead of time for validation or transient setting
            $action       = isset( $_REQUEST[ 'action' ] ) ? $_REQUEST[ 'action' ] : '';
            $nonce_action = 'paypal_buynow';

            // for testing, let's just send the request back to this page
            $submit_url   = esc_url( get_the_permalink() );

            // if no action is detected, then just display a normal page
            if ( empty( $action ) ) {

                // redirect back to this page and set the action --- this might be the only real-world link
                // for now it's ignored
                $redirect_url = esc_url( get_the_permalink() . '?action=success&nonce=' . $nonce );

                // create nonce to validate this request
                $nonce = wp_create_nonce( $nonce_action );

                // store user information we'll need on success
                // should also include transation details...
                // or a checkout number we could get later
                $current_user = wp_get_current_user();
                $user_data    = array (
                        'email'        => $current_user->user_email,
                        'display_name' => $current_user->display_name,
                        'id'           => $current_user->ID,
                );
                $data         = json_encode( $user_data );

                // encode into the transient cache -- which won't be around forever
                // we'll get it again once we get back to this page
                set_transient( $nonce_action . $nonce, $data, 12 * HOUR_IN_SECONDS );

                ?><h1>Welcome <?php echo $user_data[ 'display_name' ]; ?>!</h1><h2>Buy Stuff Now!</h2>
                <form action="<?php echo $submit_url; ?>" method="post" target="_top">
                    <input name="cmd" type="hidden" value="_s-xclick"/>
                    <INPUT type="hidden" name="return" value="<?php echo $redirect_url; ?>">

                    <INPUT type="hidden" name="action" value="success">
                    <INPUT type="hidden" name="nonce" value="<?php echo $nonce; ?>">

                    <input type="image" name="submit"
                           src="https://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif"
                           alt="PayPal - The safer, easier way to pay online">
                </form>
                <?php
            }

            // we do detect an action in the url so let's see if we can turn that into something...
            else if ( $action === 'success' ) {

                // get the nonce ready and any vars -- expect to fail but hope for success
                $nonce    = isset( $_REQUEST[ 'nonce' ] ) ? $_REQUEST[ 'nonce' ] : '';
                $data     = null;
                $trans    = false;
                $transient_key    = $nonce_action . $nonce;

                // validate the nonce
                $is_valid = wp_verify_nonce( $nonce, $nonce_action );
                if ( $is_valid ) {

                    // use the none key for transient info --- this could be store on post meta as well
                    $trans = get_transient( $transient_key );
                    if ( $trans ) {

                        // decode the info -- this was transaction info we recorded earlier
                        $user_data = json_decode( $trans, true );
                    }
                }

                // didn't work... display error
                if ( empty( $user_data ) ) {
                    ?><h1>FAILED :(</h1><?php
                }
                else {

                    // debug success!!
                    echo "<pre>";
                    print_r( $user_data );
                    echo "</pre>";
                    ?><h1>SUCCESS!!!</h1><?php

                    // convert the user information into an HTML email
                    $to      = $user_data[ 'email' ];
                    $subject = 'You are a success!!!';
                    ob_start();
                    ?><html>
                        <head>
                        </head>
                        <body>
                            <h1>Congrats <?php echo $user_data[ 'display_name' ]; ?>!</h1>
                            <h2>You Just purchased everything we have in stock!</h2>
                            <p>Trans#:<?php echo $nonce; ?></p>
                        </body>
                    </html><?php
                    $body    = ob_get_clean();
                    $headers = array ( 'Content-Type: text/html; charset=UTF-8' );

                    // send it off!
                    $emailed = wp_mail( $to, $subject, $body, $headers );

                    // display the responce
                    echo "<h3>Email send to:</h3><pre>";
                    print_r( array ( $emailed ? 'SUCCESS' : 'FAILED', $emailed, $to, $subject, $body, $headers ) );
                    echo "</pre>";

                    // destroy the information to process this request... cause we're done!
                    // you could also let it timeout... whatever
                    delete_transient($transient_key);
                }

                // debug --- just showing data passed in post
                echo "<pre>";
                print_r( $_POST );
                echo "</pre>";

                // simple button to clear the current transation
                ?>
                <form action="<?php echo $submit_url; ?>" method="post" target="_top">
                    <button name="submit">Return</button>
                </form>
                <?php
            }

            // End of the loop.
        endwhile;
        ?>

    </main><!-- .site-main -->

    <?php get_sidebar( 'content-bottom' ); ?>

</div><!-- .content-area -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>
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    I added a page template that show my suggesting working... sans the whole actual paypal... – jgraup Feb 28 '16 at 4:44

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