WordPress Developer for Birthday Date Fix

I need help with a birthday-date collection issue on a WordPress website. - Approximately 96% of registrants are missing their birthday date. We have multiple registration forms, and I’m not sure which forms are connected to Brevo or how the current integration works. Brevo is our email marketing platform, used to manage contacts and send emails. - Ultimate Member may be involved, but I’m not sure if it is the only system responsible. I would like a simple review and fix, without installing any additional plugins. What I Need - Check the existing registration forms and Brevo connection. - Identify why birthday dates are missing or not syncing. - Confirm which forms are connected to Brevo. - Fix the issue and test it. - Add this short consent statement to the relevant forms: “I agree to receive emails featuring exclusive, verified offers and occasional birthday-related messages. I can unsubscribe at any time.” Please preserve existing functionality and member data. Do not make major changes without approval. Please briefly explain how you would approach this task and what you can complete within the budget.