Hello annonymous,
Civil registration of births, marriages and deaths started in Scotland in 1855 and parish registers started around 1553.
if you are searching before 1855 you need to check the Old Parish Register entries for the marriage & Scotlandspeople always has a registration code with each entry & a digitzed copy of the entry which can be viewed, downloaded & printed. If the entry is after 1855 there will be a certificate which can be viewed, downloaded & printed on the scotlandspeople web site.
All the best
Billy