At first install Optinify from Shopify app store. Once done, you will land in the dashboard.
Steps to configure Optinify with MailerLite
1. Tap on the Option “Integration” and find "MailerLite."

2. Click on “Connect.”

3. You need the "API token" & "Group name" to get connected.
To get all those, sign in to your MailerLite account.
4. To get the "API token," click on "Integrations." You will find the option "API." Click on "use." Then click on "Generate new token." Write the "Token name." Agree to the consent and click "Create token."

5. Copy the token and paste into Optinify.
6. To get the "Group name," go to "Subscribers," then "Groups." Click on "Create group." Write the name and click on "Create."

7. Go to Optinify & write the group name. Click on connect.
8. That’s it. You are done with the integration of Optinify with MailerLite.
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