Proton Integration for Brevo & MailerLite

I’ve opened both a Brevo and a MailerLite account and now need them properly linked to my Proton email address so everything talks to each other smoothly. The goal right now is straightforward connection... (Budget: £10 - £15 GBP, Jobs: API Integration, Automation, Email Marketing, HTML, MailerLite, MySQL, PHP, Software Architecture)