analytics/lib/plausible_web/templates/billing/_checkout_button.html.eex

<button class="paddle_button button button-sm" data-theme="none" data-product="<%= Plausible.Billing.Plans.paddle_id_for_plan(@plan) %>" data-email="<%= @conn.assigns[:current_user].email %>" data-disable-logout="true" data-passthrough="<%= @conn.assigns[:current_user].id %>" data-success="/billing/success">Select</button>