The tax hereby levied shall be remitted by all operators who lease, rent or charge for occupancy within a hotel in the City of Paris to the City of Paris recorder no later than the twentieth (20th) day of each month for taxes collected the preceding month. The operator is hereby required to collect the tax from the transient at the time of the presentation of the invoice for such occupancy whether prior to occupancy or after occupancy as may be the custom of the operator. If credit is granted by the operator to the transient then the obligation to the City of Paris shall be that of the operator.