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📦 Technical Specification: Integration of Posti Delivery into Wix Checkout Form

📍 Goal:

Add integration with the logistics API Posti (https://api.posti.fi/) into the checkout process on a Wix-based website. The customer should be able to select a pickup point (parcel locker, store, etc.) during checkout and see available delivery options across Finland.

🔧 Functional Requirements:

API integration with Posti:
- Retrieve list of available pickup points (parcel lockers, stores, etc.) based on entered address or postal code.
- Display delivery options to the user during checkout.
- Transmit the selected delivery option to the order (including exact address, point type, identifier, etc.).
- Work with Posti API authentication (OAuth 2 or another specified method).
Integration with Wix Checkout:
- Display UI elements (dropdown, map, or other solution) with the list of pickup points.
- Transmit the selected information to the order (for example, in the "Order notes" field, custom field, or linked collection).
- The stored information should be accessible to the administrator in the order panel.
Compatibility with current Wix payment and order system:
- Users should not experience errors during payment.
- The integration should be seamless — the user should simply select a delivery point without being redirected to external sites.

⚠️ Potential Challenges:

Wix limitations:
- Wix does not provide full access to the server-side, limiting the use of traditional backend requests.
- It may be necessary to use Velo by Wix (Wix Code) for client-side requests and processing via web modules (backend/http-functions.js).
OAuth 2.0 authorization in Wix:
- Some types of authorization are difficult to implement purely on the frontend.
- A separate intermediate server (API proxy) may be required, especially if Wix does not allow storing client_secret.
Language localization:
- It will be necessary to display points in Finnish/English — preferably clarified with the client.
Testing with real orders:
- Testing the entire delivery chain will require test data, sandbox mode, or a test account from Posti (confirm with Posti support).

📂 What the developer must provide:

A fully functional integration (frontend + backend using Velo or proxy server)
Comments in the code and brief documentation
Instructions for Wix administrator (how to test and manage)
Support during deployment and testing

📆 Deadlines and cost:

Proposals 5

Yury Nikonenko

111 3

Budget: 12000 UAH Deadline: 5 days

Hello, Misha.
I am implementing the functionality, but considering Wix limitations, an intermediary software — a server (proxy) for working with the Posti API — will be required. I am ready to develop both the frontend and backend.

Best regards, Yuri