Problem:

The issue here is that the user wanted to convert the output of they're code to currency format. Instead of the function returning 1000 they wanted $1,000.00

Solution:

This can be done by wrapping your final output from your code with the number_format() function.

Here is a quick sample below.

$num = 1000; //value to be passed

return "$".number_format($num, 2, '.', ',');

// The above will change the format to $1,000.00

For more details on the number_format() function you can check the php documentation.
https://www.php.net/number_format

Problem:

I'd like to display the author social links in the author archive page.

Solution:

In the author archive page, you can create a custom shortcode to get the author's ID, see the solution of below thread:

https://toolset.com/forums/topic/author-page-single/#post-618800

Relevant Documentation: