Hello CaminarLatino,
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.
Constant Contact provides developers with free access to our V3 API endpoints for developers building their own application for integration. You can get started using our API by visiting our documentation here:
https://v3.developer.constantcontact.com/api_guide/getting_started.html
Additionally, you can utilize our API Reference Page to find body schemas & values, as well as test 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
There is no charge for the amount of calls made by your API. However, as with most APIs, our API has rate limits to help maintain stability and security. Our standard API access has a rate limit of 10,000 calls per day, and 4 calls per second. Once your key has hit its limit, your calls will see this error until the next day (or the next second if going over your queries-per-second limit).
While Constant Contact doesn’t offer any services as far as assistance with building custom integrations, and 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.
If you need help getting started or have questions on which authorization flow and/or endpoints may best meet your needs, please feel free to reach out to our team directly via email at webservices@constantcontact.com and reference case # 31100811.
Please have a look and let us know if you have any other questions!
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