Marketplace Seller [marketplace_seller] Field for Product Feeds

Optional for ChatGPT

The marketplace_seller attribute identifies the seller of record when a product is sold through a marketplace or third-party platform.

This field is used by ChatGPT to clarify:

• who is responsible for the transaction,
• who handles checkout and payment,
• who the user is actually buying from.

It is especially relevant for marketplaces, dropshipping models, or multi-seller catalogs.

When to use

Use this field if:

• your feed contains products sold via a marketplace,
• checkout is handled by a third-party seller,
• the merchant fulfilling the order is different from the brand or store name.

Examples include:

• Marketplace platforms
• Multi-vendor stores
• Third-party fulfillment sellers

If you are the direct seller and merchant of record, this field can be omitted.

Format

• Type: String
• Maximum length: 70 characters
• Repeated field: No
• Schema.org property: Not applicable (AI-only field)

Examples:

Minimum requirements

• Use a clear, human-readable seller name.
• Ensure consistency with checkout and payment flows.
• Do not exceed 70 characters.
• Do not use internal IDs or opaque codes.

SEO / AI Tip

Clear seller attribution improves trust and transparency in AI-powered commerce.

When multiple sellers are involved, explicitly defining the marketplace seller helps ChatGPT:

• avoid confusion during checkout,
• present accurate merchant information,
• improve user confidence in the transaction.

This field is strongly recommended for marketplaces and multi-seller catalogs.

Official Source: ChatGPT Product Feed Specs