The simple truth is that even small companies get solicited a dozen times a day. Managers at larger companies get hit up even more. Even if they get past the

The simple truth is that even small companies get solicited a dozen times a day. Managers at larger companies get hit up even more. Even if they get past the spam filter, most go strait into the trash. So to answer your first question: at a minimum you MUST get a company domain, set up a company website and email addresses, etc. This is the absolute bare minimum bar. Even dog walkers have this. Further, you must setup an actual company (LLC, corporation, whatever). No business will sign an integration deal with a random individual (if for some reason you need that) -- it's just not gonna happen. No company is going to spend a lot of time helping a non-customer individual integrate into their system without a very good specific reason. You need to understand the motivation for these other enterprise SAAS companies to setup an integration API. It will vary, but generally it often boils down 1) trying to increase sales for them or 2) trying to increase customer lock-in. If, for whatever reason, you really need to talk to someone at these companies, your best bet is to look for a connection through your personal relationship network. This is one reason why things like LinkedIn still are still valued by some despite its drawbacks. You may be surprised at who people you know know.