probably best to send a message to the community email also listed in that same doc, and ask for cla
probably best to send a message to the community email also listed in that same doc, and ask for clarification

format=auto,background=%23fff,trim=10;10;10;10 vs format=auto%2Cbackground=%23fff%2Ctrim=10%3B10%3B10%3B10 for example (the # in the colour always needs encoding)./c_crop,h_989,w_990,x_156,y_743/f_auto/q_auto/c_pad,h_870,w_870/colo field)
ETag it if you need