To find the e invoicing related options in the sales module, follow the steps below:
Step 1: Ensure that e invoice Configuration is done in GST or VAT from Administrator, then Configuration, then Features or Option.
Step 2: Also, make sure that your QR code print option is enabled in the Sales invoice bill print option, as well as Print E invoice IRN, Ack. No., and Act Date, from Administration then Configuration then Invoice Document Printing then find your Sales Invoice wether its Standard or Advance, if its Standard select the sales Invoice and enabled the option, or if its advance so design in advance format.
Step 3: Also, make sure the Voucher Series Configuration option generates an e invoice after the saving option is enabled.
Step 4: After confirming the above option, you will find the e invoicing related options in the sales module.