Hello Ranux,
If I understand your issue correctly, you have a custom form used for WP users registration, and you want that WP users to be added in a specific SendinBlue list after form completion.
We have just launched a new webapp “Automation” in beta, and this app could help you achieve easily your goal.
By using the “Identify” function in your form, you will push users data to Automation app, then you can create a scenario with :
– Start point: Identify
– Action: Add contacts to a list
You will find more information in this tutorial: https://resources.sendinblue.com/en/marketing-automation-set-up
To get Automation app in beta (free), you just have to send an email to our support team explaining that you will be happy to test the new Automation app.
We will add “Automation” features in SendinBlue WP plugin soon, but I cannot give you any date…
If you prefer using our APIs, please feel free to contact us if you have any question.
Best regards,
Gaun
SendinBlue