Hi @JainamC - sorry for the delay in response, this post was recently transferred to this board for me to answer. Fortunately, I've got a lot of resources to provide you!
Here's a list of the API endpoints we offer. For additional assistance in developing your connector, or troubleshooting assistance, please refer to our developer site here: http://developer.constantcontact.com/help-support.html
Finally, I recommend you check out this Salesforce integration that has already been developed by Cazoomi. I hope that it will suit your needs without you having to build a connector at all!
I hope this helps, and let me know if I can assist further 😃
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