Try creating a string variable like this:
and use that string variable in your API call. Not sure, depending how its being sent, you may need to urlEncode, which would look like this:
Hope that helps,
Another way to insert a new line is to simply decode it:
'Title:' + urlDecode('%0D%0D') + 'Text body …' + urlDecode('%0D')
Instead of ‘%0D’ (hex for ASCII CODE 13 [Carriage Return]), you can use this trick to insert many other whitespace characters as well. You can also use this to insert characters dynamically.
You can also get creative: