1. Enable/Disable Sendinblue API.
2. Sendinblue API key: You need to enter the Sendinblue API key to make it work.
a. Go to SMTP & API section
b. Create a new API key
c. Copy API key and paste to the Sendinblue API key field in the plugin.
3. Sendinblue list: Choose the Sendinblue list you want to work with Woo Coupon Box and save it again.
