I sell B2B software and I've noticed that lot of the customers that trial my service are developers of a company that want to evaluate it before dealing with al

I sell B2B software and I've noticed that lot of the customers that trial my service are developers of a company that want to evaluate it before dealing with all the red tape of contacting the billing department for approval. I don't do a money back guarantee, since I do a nice 14 day free trial. I've had good success with offering an "extended" trial for those in the development phase, with the prerequisite that they add a payment method to their account before I extend their trial (usually, I add 30 days). The initial 14 day trial is usually enough to "evaluate", then the extended trial goes to billing and is approved quickly, since they already know more or less that they'll be using my service. A large percentage of my customers go through the extended trial flow.