Hello @SvetlanaS47 ,
You can utilize a sign up form you make in your Constant Contact account to get contacts over to your contact database the most efficiently. If you're using a separate sign up form service, you may be able to find integrations to connect it with our system. If you've developed your own sign up form system, you can reach out to Web Services / Developer support on their site or Community board for assistance connecting the APIs.
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