When enabling the Mailchimp integration, the Happy Birthday app does not automatically pull your existing Mailchimp contacts into the Happy Birthday app.

What we recommend, therefore, is that you export your contact list from Mailchimp and then send us the file to import that list of contacts into the Happy Birthday app. More details in this article: ​How can I import existing customer birthdates into the app?

It is important that you only export contacts that have a Birthdate against their Mailchimp profile already. Contacts that do not have a valid Birthdate will not be imported into the Happy Birthday app.

Once the import has completed we will schedule a task to generate all of the Birthday discount links. We will then push those links back through to the corresponding contact in your Mailchimp account.

The Birthday discount link is a unique url to each contact and you will see it in Mailchimp as a contact merge field. You can then include that merge field in your Mailchimp Birthday email campaign template.

Read more about the Birthday discount link

Read more about adding the Birthday discount link to your Mailchimp Email Template

Please get in touch with support if you need any further assistance.