Create Fulfillment
POST https://api.ecartapi.com/api/v2/orders/{{id}}/fulfillments
Request Body
{"fulfillments"=>{"shippingDate"=>"2023-08-04T19:09:02.768Z", "tracking"=>{"companyId"=>"123", "number"=>"123456789"}, "items"=>[{"id"=>"45678", "quantity"=>"1"}]}}