Hi @AnthonyA535,
Trial users do have access to our API, please keep in mind your trial account may expire and then you will not be able to access your Constant Contact account.
Using the API for any reason, including a sign-up form, requires using the oAuth flow. We have some small code snippets of PHP under each endpoint, but it is not a full sign-up form/integration. As for adding reCaptcha I can tell you that it will work with our API. You will need to reference their documentation to ensure you write the code correctly.
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