Probably involved in copper transport and in the regulation of cellular copper level. Retrieves copper from the metallochaperone ATX1 and incorporates it into trans-Golgi vesicles. ATP + Cu(+)(in) + H2O = ADP + Cu(+)(out) + H(+) + phosphate Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IB subfamily.