Create an automation for WhatsApp's chat app?
Ok, I've figured it out myself. Putting it out here if anyone needed it in the future.
on run {input, parameters}
set text1 to the clipboard
if first character of text1 is "0" then
set text2 to 1 - text1 as integer
do shell script "open https://api.whatsapp.com/send?phone=" & "994" & 1 - text2
return
end if
do shell script "open https://api.whatsapp.com/send?phone=" & text1
return input
end run