I want to start by apologizing for the delay in getting back to you on this! When you apply for partner API access, we do have to manually approve the API key and verify that you do have an existing partnership with Constant Contact as well. However, you can create and use a standard API key freely and they are normally active within 5 minutes(However, it can take up to 30 minutes).
If you have any additional issues with getting up and running, please let us know and we will be happy to assist!
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