Xero API and Cakephp Calendar

I have have 2 things to add on a cakephp 3.6 website. It currently has a xero api installed and works fine 1. On a cakephp website I need a calendar display on a webpage . I created a temp table version that needs to be replaced with a calendar on webpage crmcta/groupbookings/viewcalendar The calendar plugin must be of type cakephp [login to view URL] . The website is at [login to view URL] The whole project can be shared via google drive 2. We use xero to upload an invoice on buying a ticket (needs to go in approved and not draft). This works and uploads an invoice through an existing api for xero. What we need done is when an invoice is uploaded, I need an email sent back to the user from xero. It is the same button as email when you view an invoice in xero. This enables the user to pay for the account right away. An example of the email function from API docs is this below which I dont understand fully. You will need to add a line to the existing API code we have for cakephp which is a xml file. The current xero api or our project works and i can upload invoices to draft. I have a demo xero account which you can have details to [login to view URL] Since the website/xero api has all been built and the xero invoicing already works this is a small job to get the email function to work.. I am also a developer so i know there isnt a lot of hours work in this. I have other jobs after this if this is done ok and in a VERY quick turn around !!