Gst lut information in e invoice

There is no such requisition in e-invoice

No number is required to b disclosed if you are exporting under LUT except GSTN

Whether API Developer can incorporate such details 

What details would API incorporate when legislation does not require any such thing

Sir as per third proviso to Rule 46

In the case of exports of goods or services or supplies to SEZ unit or developer, the invoice shall carry an endorsement as follows:-

Supply meant for Export for authorized operation on Payment of Integrated Tax under Bond or Letter of Undertaking without payment of Tax.

What to do in current situation