Is it possible to add or update multiple tag(s) in Contact form7 integration?

I recommend using Interest groups instead of tags, the Interest groups implementation in the API is more solid.

Here is example code for groups integration:
https://github.com/ibericode/mc4wp-snippets/blob/master/integrations/wp-registration-form/add-to-grouping.php

Note that you need to change the integration slug in that code to contact form 7:
https://github.com/ibericode/mc4wp-snippets/blob/master/integrations/integration-slugs.md

We also have some snippets related to tags if you really want to stick with tags:
https://github.com/ibericode/mc4wp-snippets/tree/master/integrations

Hope that helps. If you have any questions, please let me know!

Hi!

I want to add another tag if already assign a tag in Mailchimp to a particular email that registered.

Thanks!

Hello,

From our plugin, tags can only be added for new subscribers. It cannot be added when updating existing subscribers. Hence we recommend using “Interest Groups”.