Hello,   Are you creating your emails via the API, or within a Constant Contact account?  If you are creating your emails through the website using our graphical web-based editor, we have an FAQ that describes how to add dynamic links to emails.   Essentially, you already have the contact name, so you would need to add Contact ID in a custom field in each contact's details, and then you can merge the details you want to use into your email along with other portions of the HTML code that will create the hyperlink.     This can also be done when creating custom-coded emails (XHTML only), through our Advanced Editor in the User Interface, or through the Campaigns API.   If you have questions regarding use of the API to create your emails, I'll be happy to help, but you can get direct assistance from our Customer Support staff on how to create dynamic links (for custom emails, our second-level technical support team can call you and provide a demonstration of this in your account).   Cheers, ... View more

Hello,   Does the  404 error happen just after entering your account credentials, or aftter you click "Allow Access?"  I can't say for sure without knowing more, but it sounds as though after you enter account credentials and click to authorize, you may be getting redirected properly to your redirect uri, but the call being made to request exchange the authorization code that is returned as a GET parameters with that redirect is being made to an invalid url.     The flow should be:   1) You app redirects to our authorization url, where you login and click "allow access" 2) Our server redirects browser back to your redirect uri with GET parameters, including authorization code 3) Your app redirects back to our token url, passing the authorization code back (among other parameters) 4) Our server validates the request, generates the token, and POSTs back to your redirect uri.   So, it sounds like step 3 is where you're probably getting the JBOSS 404, and that probably indicates this redirect isn't correct.   It should be to: https://oauth2.constantcontact.com/oauth2/oauth/token? with parameters appended. Let me know if this helps. ... View more