Many people are suggesting you ask to use them as a reference customer, and you should, but be prepared for a 'no.' The stakeholders at the customer likely don

Many people are suggesting you ask to use them as a reference customer, and you should, but be prepared for a 'no.' The stakeholders at the customer likely don't have the authority to say 'yes', it's very likely they the request will have to go through their legal team (who probably doesn't care about whether the project is successful or not) and a marketing review, and while they may be happy to help you jump through these hoops after the deal is closed, they may not be able to get it into the contract. *I deal with many Fortune 100 companies and work this into almost every deal, but it's rejected most of the time.