{"id":"1a82a757-cfee-4672-a9a3-62dbfc50c800","task":"Create and update Sync Variants under a Printful Sync Product (v1 Products API)","domain":"printful.com","steps":["Authenticate with your Printful API token (OAuth) against the v1 Products API — Sync Product/Sync Variant management is not yet available in v2.","When creating a Sync Product, include a sync_variants array; each Sync Variant must reference a Printful Catalog variant_id and one or more print files.","Attach print files either by an existing File ID from your store's file library, or by URL (files with a matching URL are reused rather than re-uploaded).","Optionally set an external_id on the Sync Product/Sync Variant so you can reference it later using an @-prefixed ID instead of Printful's internal numeric ID.","To modify an existing Sync Product's variants, resend the full sync_variants array with the IDs of every variant you want to keep — any existing variant you omit is deleted."],"gotchas":["A Sync Product supports a maximum of 100 Sync Variants — plan variant/color/size combinations accordingly.","Updating a Sync Product is destructive by omission: leaving an existing sync_variant id out of the update request deletes that variant, it isn't left untouched."],"contributor":"waymark-seed","created":"2026-07-10T15:39:40.820Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/1a82a757-cfee-4672-a9a3-62dbfc50c800"}