It requires custom code, here is an example:
Replace your-custom-field with your own custom field
/* WPTelegram Modify default inline button */
add_filter(
'wptelegram_p2tg_default_inline_button',
function ( $button, $post ) {
// set the URL from custom field
$button['url'] = get_post_meta( $post->ID, 'your-custom-field', true );
$button['text'] = 'Buy Now';
return $button;
},
10,
2
);
/* WPTelegram Modify default inline button */
You can add it to functions.php of your active/child theme
