Title: Mailchimp API error: 400 Bad Request.
Last modified: March 13, 2019

---

# Mailchimp API error: 400 Bad Request.

 *  Resolved [Gianluca](https://wordpress.org/support/users/karnhack/)
 * (@karnhack)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/mailchimp-api-error-400-bad-request-2/)
 * I have this problem and users cannot register. How can I solve it?
    Thanks
 *     ```
       [2019-03-13 13:36:17] ERROR: Form 1102 > Mailchimp API error: 400 Bad Request. Invalid Resource. Your merge fields were invalid.
       - MMERGE1 : Please enter a value
       Request: PUT https://us18.api.mailchimp.com/3.0/lists/aa19b6d941/members/1110b609a51164e617398eba9e28cece - {"email_address":"hero***@gm***.com","interests":{},"merge_fields":{},"status":"pending","email_type":"html","ip_signup":"79.23.118.70","tags":[]}
       Response: 400 Bad Request - {"type":"http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/","title":"Invalid Resource","status":400,"detail":"Your merge fields were invalid.","instance":"6467e000-12af-4db4-bd04-96979381dfa5","errors":[{"field":"MMERGE1","message":"Please enter a value"}]}
       ```
   
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fmailchimp-api-error-400-bad-request-2%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Contributor [Harish Chouhan](https://wordpress.org/support/users/hchouhan/)
 * (@hchouhan)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/mailchimp-api-error-400-bad-request-2/#post-11325302)
 * Hello,
 * Thanks for reaching out to us.
 * As the error suggests the data being passed to the “MMERGE1” field is invalid.
   I noticed that you have copied the code from MailChimp.com hosted form into our
   form. I would recommend deleting everything in the form and adding the fields
   again by using the buttons provided on top of our form at “MailChimp for WP >
   Forms”.
 * I hope that answers your query. Let us know if you have any further questions.
 *  Thread Starter [Gianluca](https://wordpress.org/support/users/karnhack/)
 * (@karnhack)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/mailchimp-api-error-400-bad-request-2/#post-11325488)
 * Hi,
    I have simplified the form:
 *     ```
       <p>
           <label>Indirizzo Email (obbligatorio)</label>
           <input type="email" name="EMAIL" required="">
       </p>
       <p>
           <center><label>
               <input name="AGREE_TO_TERMS" type="checkbox" value="1" required=""> <a href="https://www.enotecadadavid.it/cookie-policy/" target="_blank">Ho letto e accetto i termini e le condizioni</a>
             </label></center>
       </p>
       <center><p>
           <input type="submit" value="Iscriviti">
         </p></center>
       <p>
       ```
   
 * I always get the same error. The MMERGE1 field should no longer exist:
 *     ```
       [2019-03-18 12:07:13] ERROR: Form 1102 > Mailchimp API error: 400 Bad Request. Invalid Resource. Your merge fields were invalid.
       - MMERGE1 : Please enter a value
       Request: PUT https://us18.api.mailchimp.com/3.0/lists/aa19b6d941/members/1110b609a51164e617398eba9e28cece - {"email_address":"hero***@gm***.com","interests":{},"merge_fields":{},"status":"pending","email_type":"html","ip_signup":"00.00.000.000","tags":[]}
       Response: 400 Bad Request - {"type":"http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/","title":"Invalid Resource","status":400,"detail":"Your merge fields were invalid.","instance":"279c877b-d7df-4a39-8955-f0102ae6d800","errors":[{"field":"MMERGE1","message":"Please enter a value"}]}
       ```
   
 *  Plugin Contributor [Harish Chouhan](https://wordpress.org/support/users/hchouhan/)
 * (@hchouhan)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/mailchimp-api-error-400-bad-request-2/#post-11326178)
 * Hello,
 * Can you please go to your MailChimp.com account, and share a screenshot of the
   list fields?
 *  Thread Starter [Gianluca](https://wordpress.org/support/users/karnhack/)
 * (@karnhack)
 * [7 years, 2 months ago](https://wordpress.org/support/topic/mailchimp-api-error-400-bad-request-2/#post-11326931)
 * Sorry, I only understood now. I deleted the field on the MailChimp.com website
   and now everything works. Thanks

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Mailchimp API error: 400 Bad Request.’ is closed to new replies.

 * ![](https://ps.w.org/mailchimp-for-wp/assets/icon-256x256.png?rev=1224577)
 * [MC4WP: Mailchimp for WordPress](https://wordpress.org/plugins/mailchimp-for-wp/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/mailchimp-for-wp/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/mailchimp-for-wp/)
 * [Active Topics](https://wordpress.org/support/plugin/mailchimp-for-wp/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/mailchimp-for-wp/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/mailchimp-for-wp/reviews/)

 * 4 replies
 * 2 participants
 * Last reply from: [Gianluca](https://wordpress.org/support/users/karnhack/)
 * Last activity: [7 years, 2 months ago](https://wordpress.org/support/topic/mailchimp-api-error-400-bad-request-2/#post-11326931)
 * Status: resolved