HappyForms helps you to grow customer interactions through better forms, sign-ups, surveys, polls and checkouts for WordPress.
How it works:
1. Select MailerLite in Email Integrations section.
2. Head over to Integrations screen in your MailerLite dashboard.
3. Copy value of API key input.
4. Paste this key to API key field in HappyForms.
5. Click Save Changes.