Malaysia E-Invoicing - Button for 'Send to MyInvoic'
I suggest on putting "Send to MyInvois" button instead of copy and paste the e-mail MyInvois@invoi.ci for every invoice. This is too troublesome.

Hi Maggie, after checking back in with our product team I wanted to confirm - though not a specific button in itself you could add the email address on the Contact record. If you select to 'Include in emails' the email will appear each time you're creating an invoice for that contact, saving you from having to copy & paste.
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Mark Boogaers commented
Agree the e-invoice process within Xero is too complicated for individual e-invoices. Xero is not properly integrating with the LHDN system. The email step needs to go.
Show stopper. Need to look for alternative accounting software.