Changes to Item - Create Upsert

the request property item became required

api operation id post_item_create_upsert was added

added the media type application/json for the response with the status 200

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 401

added the non-success response with the status 403

added the non-success response with the status 429

added the non-success response with the status 500

added required request body

deleted the query request parameter item

added the non-success response with the status 400

added the non-success response with the status 401

removed the request body

removed the media type application/json for the response with the status 200

api operation id post_item_create_upsert removed and replaced with

added the new optional query request parameter item

removed the non-success response with the status 400

removed the non-success response with the status 401

removed the non-success response with the status 403

removed the non-success response with the status 429

removed the non-success response with the status 500