Koha | free software integrated library system

Trying to use cURL in interfacing a PHP application with Koha, is there a cURL approach on doing this? Tried the following;

I wanna populate two DropDownMenuItems from this Map:

When adding data to firestore, the database converting DateTime object to TimeStamp My code:

I am trying to insert data from frm1 and frm2 into SQL Server at the same time. frm1 contains product information (barcode, qty , price, vat, total etc) and frm2 (contains payments information like cash and change). The idea is that when the user clicks the btnfrm2 the data from frm1 should be passed into frm2 (but not displayed), and in frm2 the user gives the payment info (cash and change) and after clicking btnsave the data from frm1 and frm2 should be inserted into the database.

I created a class, and a method to pass data to frm2.

I am developing a small pos application where user can make payments and save it into db. Until now I stored data from one form(datagridview, textboxes etc), but now I decided to add one more form (for handling payments). The idea is that the user call data from db in datagridview(*barcode, qty, name, price, total, vat et***c) , then press the btnpayment(***opens the 2nd form*), then the user give the the required data(give payment), then after clicking the pay button the data from two forms should be inserted into sql table Now I want to save data from two forms into sql db in same time using same stored procedures.

Before adding the 2nd form I used this code to insert data: