Rent on gst

Dear friends,

My query: I have paid in cash for some expenses in the month of July 2017 like pooja exp, cleaning, vehicle maintenance and so and so. But is some days crossed threshold limit of Rs.5000/- and some days can't reach the threshold limit. In these criteria, what is the role of RCM method? What are the expenses can take for the RCM? I have paid for some creditor’s payment in cash as per IT threshold limit Rs.10000/day.