PayPal Integration — Dynamic Pricing & Negotiation Flow

Automating luxury-product negotiations with real-time offers, counter-offers, and PayPal authorizations for Rug & Kilim.

E-Commerce / API Automationrugandkilim.com

I. The Challenge

High-value rug buyers often negotiate before purchasing. Rug & Kilim needed a native, frictionless way to submit offers directly on product pages — with automated backend workflows to authorize funds, calculate tax, email confirmations, and manage counter-offers — all without disrupting WooCommerce’s checkout logic.

II. The Solution & Architecture

Built a full PayPal “Make an Offer” integration using WooCommerce, custom AJAX endpoints, and PayPal’s REST API. Buyers submit offers via a front-end modal powered by Gravity Forms + PayPal JS SDK, which authorizes the payment (not capture). The backend logs the authorization, calculates tax, and generates a WooCommerce order in “offer” status. Admins can accept, reject, or issue counter-offers directly from the dashboard — triggering automated email flows.

System Architecture

WooCommerce Product Page

Custom 'Make an Offer' modal using Gravity Forms + AJAX

PayPal JS SDK

Client-side authorization & secure token generation

↓

Custom PHP Endpoints

Handle AJAX → PayPal API → WooCommerce order creation

PayPal REST API

Authorize, capture, or void payments via sandbox/live credentials

↓

Offer Management Metabox

Admin-side capture, reject, or counter-offer actions

Automated Email System

Dynamic HTML templates for customer + admin notifications

↓

WooCommerce + Logger

Order meta tracking, logging, analytics via GA + UTMs

SiteGround + CDN

Handles volume spikes during offer campaigns

III. Technology Stack

Frontend

WooCommerce Template Override
Gravity Forms + AJAX Modal
PayPal JS SDK (Authorize Intent)
Custom ZIP-based Tax Calculation

Backend & APIs

WordPress + WooCommerce
PayPal REST API (v2)
Custom PHP Endpoints & Webhooks
WooCommerce Order Meta Storage

Automation

Dynamic Offer Validation
Automated Counter-Offer Emails
Admin Capture/Reject Actions
Real-Time Logging via wc_get_logger

Infrastructure & Tracking

SiteGround Cloud Hosting
NitroPack Caching
Google Analytics Events + UTMs
Conversion Attribution

IV. Results & Impact

+15%

Increase in conversions on high-value rugs

Live

Offer flow deployed to production and actively collecting engagement data

95%

Offers handled automatically without admin input

< 400 ms

Average PayPal API latency on authorization

Key Learnings

•Mapping PayPal API responses to WooCommerce order meta simplified admin workflows & reporting.
•Automating counter-offer logic through custom metabox actions reduced turnaround from hours to minutes.
•Pre-authorizing offers built buyer trust and streamlined multi-step negotiations without plugins.