The Community is hosting an End of Summer sweepstakes! Participants must complete tasks to earn tickets that will enter them with a chance to win a free year of Constant Contact and other great prizes!*
*No Purchase Necessary. For Official Rules, visit here. Constant Contact’s End of Summer 2020 Sweepstakes ends on October, 20, 2020 at 11:50 PM EST.

Getting a response of invalid grant_type

Solution Provider

Getting a response of invalid grant_type

Getting a response of invalid grant_type though it is set to authoirzation_code


Re: Getting a response of invalid grant_type



Thank you for reaching out to Constant Contact API Support.


Are you using "authoirzation_code" exactly? If so, it looks like you may just have a typo. Try authorization_code instead and let me know if you are still seeing this error. If you are, please send an email to, and include a code snippet if possible.


David B.
Tier II API Support Engineer

Developer Portal

View API documentation, code samples, get your API key.

Visit Page

Constant Contact 2020 End of Summer Community Sweepstakes!

The Constant Contact User Community is hosting a sweepstakes. The more you participate, the more chances you have to win! Read on to learn more...

Read More