This endpoint allows you to get a recipe in BeerXML format. Replace :recipe_id with the recipe id.
<?xml version="1.0" encoding="UTF-8"?>
<RECIPES>
<RECIPE>
<NAME>India Pale Weizen (w/ Weihenstephan)</NAME>
<VERSION>1</VERSION>
...
</RECIPE>
</RECIPES>
curl -H "X-API-Key: 535ad06757dd29bd83be1e635ec10530407a8XAVTX" \
https://api.brewersfriend.com/v1/recipes/573389983.xml