I have had a lot of experience in white label work from both the technical and commercial side. If you want a call to pick my brains about specifics you would b

I have had a lot of experience in white label work from both the technical and commercial side. If you want a call to pick my brains about specifics you would be most welcome - email richard at the domain in my profile. If you can get cash up front. I can't stress how important that is. A common commercial model I'm used to is a per-user fee plus a percentage. Because that massively reduces your risk you can (and should) agree to a smaller percentage. No one ever wants 'just a re-skin'. It NEVER happens. Think hard about how many people you can afford to have sucked into the project. Be aware that you can't fully agree the scope up front. Make sure you lock down the agreed change process. Identify who is going to pay for changes. What happens if it's a success? Who pays for scaling? What changes would be on the table for phase 2? Are you trying to hand over maintenance, get bought, start up a white label business team to service this customer? What happens if it's a failure? Who makes the decision to terminate the project? Who covers the cost of shut down? You are clearly in a strong position here - it's an opportunity not a critical deal - so don't feel pressured to sign the wrong contract fast! And congratulations :-)