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Zero Middleware
Native WordPress runtime execution with 0 SaaS latency.
GPLv2 Licensed
100% unencrypted code. Inspect, extend, and deploy freely.
PHP 8.3 Ready
Tested against WP 6.7+ & Gravity Forms 2.9+ core.
WordPress Add-onv1.0.0
Formidable Webhook Retry Engine & Dead Letter Pro
Automatic exponential backoff retry queue & dead-letter alerting for failed webhooks.
4.9(1,200+ developers)
480 downloads
Billed annually
All-Access Pass
Explore →Unlock All 400+ Plugins for $199/yr
Unlimited sites, future releases & priority support.
Included With Your Purchase
Instant ZIP Download — Clean, unencrypted GPLv2 code
1-Click Automatic Updates — Directly from WordPress Admin
1 Year Priority Ticket Support — Answers in <4 hours
30-Day Money-Back Guarantee — 100% risk-free trial
100% Risk-Free 30-Day GuaranteeIf this add-on does not solve your exact Gravity Forms workflow requirement, our engineering team will resolve it or issue a prompt 100% refund.
256-Bit SSL Encrypted View Documentation
Core Capabilities
- Configurable exponential backoff retry strategy (1m, 5m, 15m, 1h, 6h)
- Dead-letter storage preserving full JSON payload and response error headers
- Manual 1-click retry button directly from Formidable entry views
- Instant Slack / Email alerts when an endpoint reaches maximum failure limit
- Comprehensive HTTP status logging with response time telemetry
- Signature verification and payload tamper protection
Technical Specifications
Versionv1.0.0 (Production)
PlatformWordPress
PHP Compatibility8.0 – 8.3+
WordPress Compatibility6.0 – 6.7+
LicenseGPLv2
Updates1-Click Automatic
Architectural
Overview
Formidable Webhook Retry Engine & Dead Letter Pro guarantees 100% webhook delivery. If third-party APIs (Zapier, Make, CRM endpoints) return 4xx or 5xx HTTP errors, webhooks are queued with exponential backoff and failed requests are saved into a dead-letter queue with instant admin alerts.
Frequently Asked Questions
Frequently Asked Questions
How do I install and configure Formidable Webhook Retry Engine & Dead Letter Pro?
Download the signed ZIP file from GravityHive, navigate to Plugins → Add New → Upload Plugin in your WordPress admin, activate the plugin, and enter your license key under Form Settings → GravityHive Licenses to enable automated 1-click updates.
Is Formidable Webhook Retry Engine & Dead Letter Pro compatible with WordPress Multisite and latest PHP?
Yes, Formidable Webhook Retry Engine & Dead Letter Pro is fully tested and supported on PHP 8.0, 8.1, 8.2, and 8.3, WordPress 6.0+, and Gravity Forms 2.7, 2.8, and 2.9+, with full WordPress Multisite (WPMU) compatibility.
What is the refund policy for Formidable Webhook Retry Engine & Dead Letter Pro?
GravityHive offers a 30-day risk-free money-back guarantee. If you encounter any technical issues our engineering team cannot resolve, you receive a prompt 100% refund.
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