How to add custom macro?

You can add custom macro by using 'rp_wcec_custom_macros' filter.
Here's the example of using this:
add_filter('rp_wcec_custom_macros', 'rp_wcec_add_custom_macros', 10, 2);

function rp_wcec_add_custom_macros($custom_macros, $args) {

$custom_macros['macro_key'] = array(
'value' => 'macro_value',

return $custom_macros;
Note that you will need to replace macro_key and macro_value with actual key and value of your macro.
And of course you can call for your own methods/functions to get that key or value, and use the parameters being sent in this filter ($custom_macros, $args).
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