call shopify api Creating a checkout response variantid is invalid

i call api Creating a checkout

the variant_id is 38894644552 is correct ,but this api response

variantid is is invalid

1. get my shop variant id

   get https://suisui.myshopify.com/admin/products/9981337608/variants.json
   Response: { “variants”: [ { “id”: 38894644552, “product_id”: 9981337608,…

2. Creating a checkout with variant id

   POST /admin/checkouts.json HTTP/1.1
   Host: suisui.myshopify.com
   X-Shopify-Access-Token: xxx
   Content-Type: application/json

   { “checkout”: { “lineitems”: [ { “variantid”: 38894644552, “quantity”: 3 }

   Response:

   { “errors”: { “lineitems”: { “0”: { “variantid”: [ { “code”: “invalid”, “message”: “is invalid”, “options”: {} }

what’s wrong with variantid 38894644552 ?

Thank you~