Provide a text that reads well and provide readers a smooth transition that builds up their interest and demonstrates your expertise in the matter. BACS, Pypal, cheques) within a pre-decided time period, the source being a variable percentage of money they receive on every purchase an online shopper clicks on the links of the retailers listed on these portals he is redirected to the retailer's website and if he buys a product he would be liable to claim and hence get the cashback percentage promised by the portal on that particular retailer