We will change the available sorting methods. As of the 31st of March only the following sorting methods will be available. The other sorting methods will be deprecated.
rankdesc - Sort on sales ranking descending
priceasc - Sort on price ascending
pricedesc - Sort on price descending
datedesc - Sort on publishing date descending
ratingdesc - Sort on rating descending
For the old, to be deprecated, sorting methods, please consult: LINK