Pulsar

Do you know that up to 90% of visitors simply leave the website?
Pulsar connection button allows you to raise the conversion of your website by 125% thanks to a unique callback technology in 27 seconds.
No more busy lines! Different dialing scenarios allow you to connect the first free agent with a customer and close the deal.
In your personal account you can see the analysis of calls, the work of your operators and listen to conversations.
The widget offers a quick connection for the website visitors on the choice: a phone call, a call order at convenient time, a ticket creation or chat communication via Facebook Messenger.
Plugin allows you to install the widget to your website without programming skills.
<iframe loading="lazy" class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/xmAW9LoumQM?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<h4>How does the widget work?</h4>
You set the widget code to your website. 
Once a potential customer leaves you his phone number and click on Call me button, 
Pulsar system calls and connects him in 27 seconds to the first free manager.
<h4>What will be if my telephone line is busy?</h4>
You can specify more than one number to receive incoming calls and set up dial-up script (consistent / parallel). 
Under script «Consistent»: if the number of the first employee is busy, our service calls the next free manager from the list of numbers you have specified. 
Under script «Parallel»: call goes simultaneously on all numbers mentioned and connects with the manager who answers the call first.
<h4>Where will goes call if there is no one in the office?</h4>
After hours the widget works in the night mode, offering visitors to write a letter or to order a call at an appropriate time the next business day.
Sign up for free: <a href="http://pulsarcallback.com" rel="nofollow ugc">http://pulsarcallback.com</a>

Callback widget Pulsar

The quick connection button for the website.

digitalpoint

The Shortcode Callback plugin allows you to use a [callback] shortcode to execute arbitrary PHP code wherever the shortcode is used.
Usage
Execute someFunction() and insert whatever it returns with the following shortcode: 
 [callback function=”someFunction”]
Example shortcode to include a PHP file (the path is relative to WordPress’ ABSPATH), then insert the results of someFunction() where you used the shortcode: 
 [callback include=”custom/filetoinclude.php” function=”someFunction”]
Shortcode example that includes a PHP file (the path is relative to WordPress’ ABSPATH), then passes a paramter to someFunction() and returns the results where you used the shortcode: 
 [callback function=”someFunction” include=”custom/filetoinclude.php” param=”something”]
The format to call a class/method with the shortcode is exactly the same as above, except you specify the class::method in the “function” attribute of the shortcode. 
 [callback function=”someClass::someFunction” include=”custom/filetoinclude.php” param=”something”]
There is an example (with PHP code) <a href="https://wordpress.org/plugins/shortcode-callback/faq/" rel="ugc">over here</a>.

Shortcode Callback

Adds a [callback] shortcode that can trigger PHP code so you can insert custom/complex things into your pages/posts.

Callback widget Pulsar vs Shortcode Callback