Ajax PHP Class Structure WordPress data: { action : 'ds_calculators::myfunction', }, - php

Question

It's been a while since I've worked with AJAX and Wordpress. The way I used to do things was pretty straight forward and using the function name where the function is created within functions.php then I add action using :
add_action('wp_ajax_nopriv_myfunction', 'myfunction');
add_action('wp_ajax_myfunction', 'myfunction');
I'm drawing a blank here as now I structure my PHP code a little different and my function is no longer located in my functions.php file. It's located within a class named:
ds_calculators
$.ajax({
type: 'POST',
url: my_ajax.ajaxurl,
data: { action : 'ds_calculators::myfunction', },
success: function(data, textStatus, XMLHttpRequest)
{
//jQuery('#table_listing').html(''); // empty an element
jQuery('.changer').html(data); // put our list of links into it
},
error: function(XMLHttpRequest, textStatus, errorThrown)
{
if (typeof console === "undefined")
{
console = {
log: function() {},
debug: function() {},
};
}
if (XMLHttpRequest.status == 404)
{
console.log('Element not found.');
}
else
{
console.log('Error: ' + errorThrown);
}
}
});
I now add action like this
add_action('wp_ajax_nopriv_myFunction', 'ds_calculators::myFunction');
add_action('wp_ajax_myFunction', 'ds_calculators::myFunction');
For the above I'm hitting a 400(Bad Request). How does one include the function name when that function is within a class? Is that my issue or is something else my issue?