If you will receive products, services or second-hand goods through the Oprigram app: 1. Look at the offerors scores, positive and negative comments, and especially their digital identity (instagram, youtube, facebook or website). Review comments on his posts on social media. 2. If you are going to buy products via e-commerce system, make sure the website is secure. 3. We recommend shopping in your own country or globally known e-commerce systems. 4. We recommend you to make a public, face-to-face and safe environment if you are going to make a second-hand product shopping or shopping that you are not sure to trust. We also recommend you go with a friend. 5. If you are going to get service from an unrecognized person or if you are uncertain about trusting the service provider, make sure you are not the only one in your home.