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MailerLite integration with native form interaction

Hello!
I am looking for some help with MailerLite integration. I can integrate MailerLite with Webflow form
using simple MailerLite form action and input names (look up at my attachment). I want to show a native successful form message after submitting the form. I know there are some code solutions like for Basin integration - Form submissions to third-party service with native interactions. Has anyone solution to how to do it?

Attachment.
Zrzut ekranu 2021-04-29 o 10.24.47 Zrzut ekranu 2021-04-29 o 10.25.08 Zrzut ekranu 2021-04-29 o 10.25.20 Zrzut ekranu 2021-04-29 o 10.26.53