FDN Newsletter Bridge

FDN Newsletter Bridge connects a WordPress site to the FDN tools CRM (tools API v2). It collects newsletter signups from popular form plugins and keeps WordPress user accounts in sync with CRM contacts.

Newsletter signups

• Contact Form 7 — only the form IDs you explicitly whitelist

• Mailchimp for WordPress (MC4WP) — forms and sign-up checkboxes

• WPForms — only the form IDs you explicitly whitelist

• Elementor Pro Forms — only the form names you explicitly whitelist

• Any other source via the fdn_nb_subscribe() helper function

WordPress user sync (optional)

• User registration creates a CRM contact (name, surname, email, billing phone)

• Profile updates keep the contact up to date

• User deletion permanently removes the contact from the CRM (GDPR right to erasure)

• GDPR consent is recorded only when the visitor actively ticks a consent checkbox — never automatically

• One-click initial sync for existing users, processed in batches

Reliability

• All operations go through a database queue with automatic retries and exponential backoff — nothing is lost during API downtime

• A database-level lock guarantees a single queue processor at a time (no duplicate contacts)

• Self-chaining background processing that also works on hosts where WP-Cron never fires

• Test mode: everything is logged, nothing is sent

• A permanent local subscriber archive that survives plugin uninstallation

REST API

The plugin also exposes a read endpoint for your own tooling: GET /wp-json/fdn-nb/v1/subscribers (protected by an API key header) with pagination and incremental sync support.

gr (FDN tools CRM) to synchronise contacts. Data sent includes the subscriber e-mail address and, for user sync, name, surname and phone number. An API key issued by the FDN tools administrator is required.