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② 後台搜尋「ifthenpay | Payments for Formidable Forms」→ 直接安裝（推薦）
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ifthenpay Payments for Formidable Forms adds ifthenpay as a payment option on Formidable’s own “Collect a Payment” form action.
In plain terms you get:
* One Gateway Key on your ifthenpay Backoffice, usable across every form on the site
* A live, editable table of every payment method provisioned on that Gateway Key, with per-method enable/disable and a default method
* Automatic, secure hosted-page checkout with no PCI scope on your server
* Real-time status sync back into Formidable’s native Entries and Payments admin screens
All settings are managed within Formidable’s own Global Settings screen and your ifthenpay Backoffice. The plugin is designed so site owners can handle payments without requiring advanced technical knowledge.
Requirements
An active ifthenpay merchant account with a Backoffice Key.
A Gateway Key registered to that Backoffice Key, with the payment methods you want to accept provisioned on it.
Formidable Forms (free) must be installed and active, with its bundled free payments module (this plugin does not currently support sites using the separate paid Formidable “Payments” add-on).
WordPress 6.3+ and PHP 7.4+, with HTTPS (SSL) enabled on your site.
External Services
This plugin connects to the ifthenpay API (https://api.ifthenpay.com) to:
Validate your Backoffice Key and list the Gateway Keys registered to it.
Fetch the payment methods available and provisioned on your Gateway Key.
Create a Pay by Link payment session when a form with an ifthenpay payment action is submitted.
Register the webhook URL ifthenpay uses to notify your site when a payment completes.
Look up a payment’s live status (/gateway/transaction/status/get) as a supplementary check while the payer waits for the async webhook.
Data sent includes: your Backoffice Key and Gateway Key (setup and settings screen); a payment reference id, amount, description, enabled accounts string, success/error/cancel return URLs, language, and optional link-expiry date and default method (on submission); your site’s callback URL (when saving settings); and the transaction id ifthenpay returned for that payment (for the live status check).
No card, MB WAY, or bank data is ever collected or stored on your server — the payer completes payment entirely on ifthenpay’s own hosted page. See ifthenpay’s terms of service (https://ifthenpay.com/termos-e-condicoes/) and privacy policy (https://ifthenpay.com/politica-de-privacidade/).
Key Features
Full integration with Formidable Forms’ free “Collect a Payment” action, alongside Stripe/Square/PayPal
Secure, PCI-out-of-scope checkout via ifthenpay’s own hosted Pay by Link page
Automatic payment confirmation via a dedicated server-to-server callback endpoint
Support for every payment method provisioned on your Gateway Key
Configurable payment link expiry (in days)
Customizable Payment Received / Payment Pending confirmation messages and behavior
Customizable pay button text and logo placement
Real-time payment status in Formidable’s own Entries and Payments admin lists
Multi-language hosted payment page (English, Portuguese, Spanish, French)
Security first — no card, MB WAY, or bank details ever stored on your server
License
This plugin is licensed under the GPLv3.
Support
For assistance use the WordPress.org support forum: https://wordpress.org/support/plugin/ifthenpay-payments-for-formidable-forms
Pre-checks before posting:
* Payment method enabled on your Gateway Key AND enabled on the ifthenpay settings screen
* Running current recommended versions of WordPress, PHP, and Formidable Forms
* Webhook callback URL reachable (not blocked by a firewall, security plugin, or maintenance mode)
ifthenpay support: contact your ifthenpay account manager or https://ifthenpay.com/
Formidable Forms docs: https://formidableforms.com/knowledgebase/
