This study aims to determine and understand the form of application of the maximal cashback system in the fiqh muamalah review of the Maximal Cashback strategy in the Online Shop (Shopee and Tokopedia Case Studies). This research uses a qualitative descriptive research that focuses on the study of manuscripts and texts, uses a normative juridical approach to explore sources of law and a sociological approach to analyze the object of research. The results of the study found that the form of implementation of the maximal cashback is to put a cashback percentage, but the maximum cashback received by consumers has been determined from the start by adding information under the promotion. When the cashback has reached the maximum specified amount, regardless of the amount or price of the product purchased, the cashback received is only the maximum amount according to the provisions of the organizer. Then, cashback is generally allowed and the contract used is appropriate, but it should be noted that the maximum form of cashback is that the two parties to the contract (seller and buyer) especially for the buyer are required to know and understand the terms and conditions so as not to be misleading (misunderstanding). ) so that the transactions made do not fall into tadlīs (fraud) because buyers feel cheated by the cashback offer given.