Why does fulfillment_id from Shopify sometimes show as 'Null'?

Hi

Any one knows:Why sometimes when we get the fulfillment_id from shopify,it shows"Null",and how can we solve it?Thanks

Best regards

Angela

Do you have fulfillments for those items (Orders?)

Hi Peter,

These are new orders,we don’t fulfill it.But other orders that we also don’t fulfill it have fulfillment_id.so we are wondering why this happens