How can I create an e invoice in BUSY by using the API?

If you want to create an e invoice from BUSY by using api, you need to follow these steps:
Step 1: First you have to create a gsp id and Password by login to your e invoice portal then click on api registration and Select create api user option under user credentials menu.
Step 2: Here, you need to Select through gsp and select your gsp name either webtel electrosoft private limited or pinnacle finserv advisors private limite.
Step 3: Create the username and password then submit.
Step 4: Open your company in BUSY then, go to administration menu and click on configuration.
Step 5: Select features and options and click on gst or vat tab, here you will see an option called e-invoice required.
Step 6: Set Y to turn it on and mention your place and pincode.
Step 7: Then enter gsp user id and password under the gsp configuration tab then save.
Step 8: Go back to administration menu and click on configuration.
Step 9: Select voucher series configuration option and choose the voucher type such as sales, sales return, etc.
Step 10: Then, select the voucher series and click on voucher configuration.
Step 11: Here, you will see options of input transport details and generate e invoice after saving, set as Y to enable them.
Step 12: When you create an invoice you need to enter the required details in transport details window and set Y on e invoice required field then you will popup for e invoice generation.