WHMCS Custom Intergration with custom CRM

We have a custom built CRM that we have active users in. We want the CRM to push through details and register an account for current WHMCS also. We also want a feature where if we add a new user in our CRM it pushes through to WHMCS and also creates an account in WHMCS. It would be even better if while inside the CRM that if they click on support ticket ( which is the WHMCS support ticket section ) it doesnt ask them to login because it matches their login that was created in the CRM. Is not a must but would make the final result awesome. I know this can be done with login hooks that WHMCS supplies in their build. Must be experienced in WHMCS, php and javascript. It's very important that you know what your doing.