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Update: Ship With Walmart API shipping estimate date fields

Date: August 20, 2026

Walmart has updated the Ship with Walmart Shipping estimate API documentation to clarify the requirements and usage of the shipByDate and deliverByDate parameters. These new updates provide detailed descriptions of the required ship by and deliver by date.

What changed

  • shipByDate and deliverByDate parameters have been updated to required fields.
  • Descriptions for shipByDate and deliverByDate have been updated to clarify the sourcing of these values in the API.

Why it matters

  • The updates ensure the API documentation accurately reflects the endpoint behavior across marketplaces.
  • The documentation now correctly identifies shipByDate and deliverByDate as required fields.
  • For the U.S. Marketplace, the revised field descriptions provide additional guidance on the source of these values, helping developers better understand and use the shipping estimate response.

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