Hello user538925,
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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.
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While our expertise is with our API itself as opposed to its implementation within any particular programming language, we are happy to answer any questions pertaining to Constant Contact’s API endpoints, functionality, and documentation.
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The request for V3 application code samples is currently under review. However, we're currently still adding endpoints and capabilities to the V3 API, and do not plan to publish official SDKs or sample apps until that process is complete. Your feedback and experience with this request is essential to improving our product, so thank you for reaching out to us regarding this matter.
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In the meantime, here are the example calls that are currently available for V3:
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V3 Code Samples:
https://v3.developer.constantcontact.com/api_guide/tag_code_samples.html
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Additionally, you can utilize our API Reference tester to test out the functionality of our available endpoints to see how they will work once programmed within your application:
https://v3.developer.constantcontact.com/api_reference/index.html
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For additional reference, here is the link to a sample that was created/shared on our Developer Forum by a 3rd party developer (NOT created or supported by Constant Contact) for V3 using PHP:
https://community.constantcontact.com/t5/Developer-Support-ask-questions/PHP-V3-Library-now-updated-to-new-OAuth2-endpoints-and-PKCE/td-p/383773
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However, if desired, please feel free to email use securely at webservices@constantcontact.com with the full request(s) where you are receiving the response error (including URL, headers, timestamp, and request body), and the full response body so that we can so that we can better assist you in trying to identify the root cause of the issue.
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Please have a look and let us know if you have any other questions!
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