課金

tax levied on a conquered people by an army / fee for a divination session / variant of 氪金[ke4 jin1], in-app purchase (gaming)

subject / course / CL:門|门[men2] / class / lesson / CL:堂[tang2],節|节[jie2] / to levy / tax / form of divination

surname Jin / surname Kim (Korean) / Jurchen Jin dynasty (1115-1234)

gold / chemical element Au / generic term for lustrous and ductile metals / money / golden / highly respected / one of the eight categories of ancient musical instruments 八音[ba1 yin1]