API changelog: 2026

A new exemption type, partial, records a customer's California partial exemption certificate, such as the one for qualifying manufacturing and research equipment. Unlike a full exemption, a sale to that customer stays taxable: Kintsugi applies the reduced rate the certificate allows to qualifying items sold in California. Create one with exemption_type partial and a certificate_type on POST /v1/exemptions, or with exemptionType and certificateType on POST /exemptions and POST /exemptions/bulk in the 2026-07-21 release. The certificate type is the form's code from GET /v1/exemptions/partial-certificate-types, which lists each form's code, name, jurisdiction and country; its optional jurisdiction parameter narrows the list to one state, ignoring case. Today the list holds nine California forms. A partial exemption needs country US and jurisdiction CA, and the certificate type is accepted only on a partial exemption. Exemptions, including those embedded in transactions, now report the certificate type, which is null for every other type. Partial exemptions are available to organizations that have them enabled; for any other organization, creating one answers 400.