how to change to prepaid electricity

{"cid":"91149723","title":"Strong Smart Prepaid Electricity Meters with IEC Standards and Remote Control for Flexible Utility Management","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/3c\/0c\/c4b0efe435d224c5c78cd041357e-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"Calin","Model Number":"CA168-M","Minimum Order Quantity":"Negotiation","Delivery Time":"30 days","Certification":"CE\/\/IEC","Place of Origin":"China","Payment Terms":"western Union,Paypal,T\/T,L\/C","Supply Ability":"70,000pcs per month","Packaging Details":"Carton","Product Name":"1 Phase Smart Electicity meter","Application":"Residential low voltage","Dimensions":"160x112x58mm","Weight":"750 g","Display":"Backlit LCD","Accuracy":"Class 1s","Payment mode":"Hybrid","Material":"Uv Stable polycarbonate"}}

{"cid":"91176406","title":"Contactless RF Intelligent Electric Meter , Prepaid Energy Meter Using Smart Card","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/6f\/83\/7bd582088b8f73be82bc24522b6b-200x200-1.jpg","attrs":{"Price":"Negotiate","Brand Name":"Radarking","Model Number":"DTSY150\/RF","Minimum Order Quantity":"100pcs","Delivery Time":"30 days","Certification":"IS09001; IS014001; IEC62052-11; IEC62053-21;","Place of Origin":"Made in China","Payment Terms":"Western Union, T\/T, L\/C","Packaging Details":"Standard Package","Supply Ability":"5000000 pcs\/year","Theory":"Three Phase Prepaid Electric Meter","Card Type":"RF Card","Indicator":"LED","Data Storage Period":"More than 10 Years","Refer. Voltage":"3*220V\/230V\/240V","Refer. Current":"3*5(40)A"}}