How to insert link into code ?

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Is there a shortcode functionality to use with do_shortcode() ?
I cannot find a way how i can insert affiliate link into code. I tried using <ta> tag but that gives no result, of course. It’s probably a filter that runs before post content is pasted on page and turns all <ta linkid=”num”> into proper links, but using <ta> in custom page template gives output with same <ta> tag.