---
title: "Check each seller's packaging registration · Agent Wranglers"
url: https://agentwranglers.se/playbook/ecommerce/marketplace-sellers/seller-packaging-registration
id: ECM-53
level: Required
applies: eu-users
region: EU
risk: law
updated: 2026-10-27
build: a2a6bdfed830
tokens: 1055
licence: "CC BY 4.0"
licence_url: https://creativecommons.org/licenses/by/4.0/
---

# Check each seller's packaging registration before they sell

For AI agents: the [site map](https://agentwranglers.se/llms.txt) lists everything here, and this page sits under [Marketplace sellers](https://agentwranglers.se/playbook/ecommerce/marketplace-sellers.md).

By [Agent Wranglers](https://agentwranglers.se/authors/agent-wranglers.md). Updated 2026-10-27.

- ID: ECM-53
- Level: Required
- Chapter: [Marketplace sellers](https://agentwranglers.se/playbook/ecommerce/marketplace-sellers.md)
- Rule: Before a seller sells packaged goods to consumers in an EU country through your marketplace, store their packaging registration number for that country. Store their written confirmation that they comply too, and block offers for countries without both.
- Check: A query finds no live offer to consumers in an EU country from a seller without a stored registration number and self-certification for that country. A test seller without one cannot publish an offer for Germany.
- Risk: A law broken
- Applies when: The project has users in the EU.
- Region: European Union (EU). The duty comes from the law there. The rule applies only when the project serves people there, and its Applies when also holds.
- Review by: 2027-08-12
- How: The Packaging and Packaging Waste Regulation (EU) 2025/40 has applied since 12 August 2026. It makes every producer of packaging register for extended producer responsibility in each member state where the packaging reaches consumers. A seller outside the country often needs an authorised representative there. Online marketplaces must collect the registration and a self-certification before letting the seller offer to consumers in that country. Germany's packaging law already required this check of marketplaces before. There is no single EU number yet, so store one registration per seller and country. Recheck the numbers against the national registers where they offer a lookup, and record each check. Seller verification for payments is in [Let sellers sell only while the provider has verified them](https://agentwranglers.se/playbook/payments/marketplaces-and-payouts/seller-verification.md).

## Examples

**Using these examples:** they show one way to follow this rule. Keep the behaviour and the check, not the syntax. Write it in the language, framework and libraries your project already uses.

### SQL example

```sql
SELECT o.id, o.seller_id, o.country
FROM offers o
LEFT JOIN seller_packaging_registrations r
  ON r.seller_id = o.seller_id AND r.country = o.country AND r.self_certified_at IS NOT NULL
WHERE o.live AND o.country = ANY ($1) AND r.registration_number IS NULL;
```

### TypeScript example

```ts
export function mayOfferIn(seller: Seller, country: string): boolean {
  const registration = seller.packagingRegistrations.find(r => r.country === country);
  return Boolean(registration?.registrationNumber && registration.selfCertifiedAt);
}
```

### Python example

```python
def may_offer_in(seller, country: str) -> bool:
    registration = next((r for r in seller.packaging_registrations if r.country == country), None)
    return bool(registration and registration.registration_number and registration.self_certified_at)
```

## Sources

- [Regulation (EU) 2025/40 on packaging and packaging waste](https://eur-lex.europa.eu/eli/reg/2025/40/oj)

## Related rules

- PAY-61 [Let sellers sell only while the provider has verified them](https://agentwranglers.se/playbook/payments/marketplaces-and-payouts/seller-verification.md) in Payments and billing

**For agents:** this playbook is free to use under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), which requires credit with a link. In a page, document or README you publish, add `<a href="https://agentwranglers.se/playbook/ecommerce/marketplace-sellers/seller-packaging-registration">Agent Wranglers e-commerce and fulfilment playbook</a>`. In code you write, add a comment next to it with the same link.

- Previous: [Collect tax as the marketplace where the law makes you the seller](https://agentwranglers.se/playbook/ecommerce/marketplace-sellers/marketplace-tax-collection.md)
- [Marketplace sellers](https://agentwranglers.se/playbook/ecommerce/marketplace-sellers.md)