I am a partner, and i have signed up with LeadPages.
They integrate with Constant Contact.
I wanted to know about getting additional API keys for my various CC clients so that I can create landing pages for them and then have those responses go into the appropriate database.
My clients are
With Constant Contact's API, our keys are related to a specific application (LeadPages for example) rather than being associated with an account. After a little bit of research, it looks like with the LeadPages integration with Constant Contact they correctly provide the API key for you and you simply need to connect the desired Constant Contact account. Because of this, you should not need to create any API keys in order to connect your clients' accounts with LeadPages.
You can find a guide from LeadPages on how to get up and running with the integration here: https://support.leadpages.net/hc/en-us/articles/203522670-How-do-I-integrate-ConstantContact-with-a-...
If you have any questions, please let me know!