Applying to a CPA network can be very different from applying for other traditional programs because there is a greater degree of verification within the network both for advertisers and publishers alike. Don't expect to be accepted automatically just because you fill in the application form, because this is just the just the beginning of the process rather than the end. You will be investigated much more carefully than with a PPC affiliate type program. They will make sure you are the person you say you are, even going as far as to check ownership of websites and contact information you gave on the application form to ensure everything matches. Be as accurate as possible when applying to CPA networks as they are very selective about who they accept.
The CPA network employs people who know how to spot deception in an application by cross-checking one piece of information with another. For instance, if you give one name on the application form but the owner of the website in the WhoIs record is someone else, they may decide you're not being honest with them. Also, if you give out a phone number or email address that you never respond to it will be an automatic red flag that will kill your application, so be prepared to answer the phone and/or email promptly to speed up the approval process.