Transforming merge tags for an entire list on MailChimp

I am currently updating them using this method: http://developer.mailchimp.com/documentation/mailchimp/reference/lists/members/#
Solution:
It may be too late for this response, but the Mailchimp API V3.0 now utilizes batch operations. You can store various operations of this kind in an array and send a POST request to /3.0/batches. For more information on Mailchimp’s batch operations, visit http://developer.mailchimp.com/documentation/mailchimp/guides/how-to-use-batch-operations/
Question:
When a current subscriber attempts to subscribe again, how can I add their duplicate email address to the Mailchimp subscriber list?
You have the option to create a second list, although these lists do not communicate with one another.

Question:

I am currently utilizing MailChimp’s API v3 to
send emails
. Within my list, I have approximately 10,000 subscribers whom I wish to modify all MERGE TAGS for. Currently, my approach involves obtaining the List ID, retrieving all the emails within that list, and individually updating the field for each one.

Is there a method to update all of them without spending 2 hours on each change?

I’m currently in the process of updating them using this method: http://developer.mailchimp.com/documentation/mailchimp/reference/lists/members/#


Solution:

It may be too late for this response, but

The utilization of
Batch operations
is now required when using Mailchimp API V3.0.

It is possible to store various operations of this kind in an array.

operation = {
   method : 'put',
   path : '/lists/'+list.id+"/members/"+hashEmail,
   body : {
       FNAME: "Jhonny", 
       LNAME: "Bravo" , 
   }
}
batchOperations.push(operation);
operation = {
   method : 'patch',
   path : '/lists/'+list.id+"merge-fields/" + merge_id
   body : {
          tag : field.tag,
          name : field.name,
          type : "text",
          public : false,
          default_value : ""
   }
}
batchOperations.push(operation);

Submit a
POST request
to the /3.0/batches endpoint.

 request = {
    method : 'post',
    path : '/3.0/batches',
    body : {
       operations : batchOperations  
    }
 }

Additional information regarding batch operations in Mailchimp can be found at this link: http://developer.mailchimp.com/documentation/mailchimp/guides/how-to-use-batch-operations/

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