I'm not a Freelancer for 3D but have created some Webpages for Companys. What i've done all the times was: 1. I made a offer on Paper which contains: Price, Delivery-Time and Payment-conditions 2. Then the Company had to send me a Purchase-Paper 3. I sent them a Confimation what they ordered 4. Handed over the work/data 5. Sent em a Bill This is the normal Business-way and if you do it this way the company knows that if they doesn't pay they loose at any court in the whole world. It's a little bit more work but this is standard in most real business. The idea of a Database looks like could work but doesn't protect at all. What i would do