**Tehden ERP version 26.5.00** released 29.09.2026

Only changes to v2605, no changes to v2308

Endpoints
- New endpoint: GET /campaigns 
- New endpoint: GET /campaigns/{campaignId} 
- New endpoint: GET /campaigns/{campaignId}/offers 
- New endpoint: GET /offers/{offerId} 
- New endpoint: GET /offers/{offerId}/products 
- Added values `campaigns` and `campaigns.offers` to the `include` query parameter of GET /products and GET /products/{productId} 
- Added `campaigns` (active sale campaigns containing the product; each with `campaignId`, `name`, and `offers` when `include=campaigns.offers`) to the GET /products and GET /products/{productId} response