# REST API misparses comma decimals in shipping cost

Market: WooCommerce

WooCommerce store owners and developers setting flat rate shipping via the REST API need comma-decimal values like "5,50" saved correctly, instead of 550 being charged at checkout.

Source: https://idea.2folk.com/clusters/22

## Size

- Posts: 2
- Unique authors: 1
- Average severity: 3.0 of 5
- First seen: 2026-10-05. Last seen: 2026-10-05
- Trend: new in the last 28 days
- Authors who say they plan to switch: 0

## Who has the problem

- developer \(2\)

Store size hints:
- none found

## What they do today

- none found

## Tools named

Tools they complain about:
- none found

Alternatives they name:
- none found

## Price hints

- none found

## Evidence (top 2 by severity)

- [Saving flat rate shipping cost as "5,50" via the REST API stores 550, so carts would be charged 550 for shipping. The related PR does not fix it.](https://wordpress.org/support/topic/flat-rate-shipping-cost-550-incorrectly-saved-as-550/) — 2026-10-05, wordpress, severity 3
- [Saving flat rate shipping cost "5,50" via REST API wc/v3 and v4 stores 550, so carts would be charged 550 shipping; the PR doesn't fix it.](https://wordpress.org/support/topic/flat-rate-shipping-cost-550-incorrectly-saved-as-550-in-wc-v3-v4/) — 2026-10-05, wordpress, severity 3

## Before you build

- This is a signal, not proof of a buyer. Talk to at least 5 of the authors first.
- Check each named tool for price, rating, and recent reviews on its own site and app store.
- Write down what a buyer would pay and what they pay now.