Hello Daphne,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API. Below is a link to documentation on how to obtain an API Key and Access Token along with documentation on how to implement that information into the Bloom plugin.
How to generate an API Key and Access Token: https://community.constantcontact.com/t5/Community-News/How-to-generate-an-API-Key-and-Access-Token/ba-p/293856
Constant Contact and Bloom https://www.elegantthemes.com/documentation/bloom/accounts/
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