Product Customer-Group Prices — Update

Updates a tier-price row. Partial: only send the fields you want to change.

Endpoint

Endpoint	Method
/api/admin/catalog/products/{productId}/customer-group-prices/{id}	PUT

Request body

Same field set as Create — qty, value_type, value, customer_group_id.

Errors

HTTP	Cause
404 Not Found	Product or row not found, or row does not belong to product.
422 Unprocessable Entity	Validation failed (uniqueness, unknown group, etc.).