erellsworth

Just use Contact Form 7’s normal shortcodes like so:
‘[email* your-email]’ 
‘[checkbox sendinblue-opt-in default:1 “Subscribe” ]’ 
‘[hidden sendinblue-list-id “13”]’
That’s all there is to it.

Contact Form 7 SendInBlue Opt-in Checkbox

Not working

It integrates the form with Send In Blue very well. =)

but if we are using the official SendinBlue plugin, they seem to conflict and the officil plugin stops working.

It is a very useful plugin.

WordPress plugin to add a SendinBlue Opt-in checkbox for Contact Form 7

Sébastien GENDT

With the GRC Contact API for Sendinblue plugin, you can intercept the data sent by a form created with the official Sendinblue plugin for WordPress in order to send them via the CRM GRC Contact API.
Any Internet user who has filled in a form on your WordPress website will create a contact in your CRM GRC Contact without a line of code.
The plugin is compatible with all fields of a company, of a contact and their custom fields.
Get your API account key and password, let’s go!

GRC Contact API for Sendinblue

The GRC Contact API for Sendinblue plugin allows you to send data from a Sendinblue form to create a contact in the CRM GRC Contact.

Contact Form 7 SendInBlue Opt-in Checkbox vs GRC Contact API for Sendinblue