Update rate multipliers for active channels. If a value for some channel is not specified, then the rate multiplier for the channel will be kept unchanged.

Allowed values for keys are: HOSTFULLY, AIRBNB, BOOKINGDOTCOM, HVMI, VRBO, GOOGLE, GETAWAY_GO_GO, GOLIGHTLY, HOMADS, NEXTPAX, RED_AWNING, RENTALS_UNITED, TRIP_ADVISOR, VACAY_MY_WAY, WHIMSTAY