Add some functions to an existing Wordpress Plugins

Purpose of the work is to enhance current plugin : [login to view URL] “StockUnlocks – Mobile and Cell Phone Unlocking” is open source software Current Plugin allow to automate through DHRU Api "remote services" orders place by customers. Plugin allows to import products based on dhru server services availability, but also allow to turn in already existing product into "remote services". Plugin creates on product page via ACF Plugin (Distributed version) an IMEI field with Email+Email confirmation field. Plugin allows bulk orders. Currently once order is placed, Customer received woocommerce receipt email (and invoice if setup). Once then, Stockunlock plugin send it owns email when order is placed and completed (Plain Text UTF8 email). Each action is recorded as an admin note. Issue is Stockkunklock doesn't update Order status, but without generating a woo commerce email confirmation. This plugins relies on its own status orders. (Code available, Code unavailable, Code ordered, etc…) Work expected is : 1. Ensure that once StockUnlock Plugin moves Order to "Code Available or Unavailable", a new action is automatically set to update statuts to (standard Woocommerce status, see below) and ensure woocommerce email confirmation is sent accordingly. Code available > completed Code unavailable > failed Paypal rejected > cancelled etc.. other TBD. 2. Currently, StockUnlock monitor from an item/product perspective, 5 meta data are updated automatically by this plugin: suwp_imei_values: (as IMEI) suwp_email_response: (as Customer Email) suwp_email_confirm: (as Customer Email confirmation) _suwp_qty_sent: 1 (as number of order placed) _suwp_qty_done: 1 (as number of order replied) Once all orders are replied, plugins insert a comment (as an admin note not visible to client). Work expected is to: Insert Reply orders in HTML format into Client Orders and Woocommerce Confirmation Email. a new item meta being created and updated with each reply from DHRU Server. In case this solution is not workable, alternative solution would be to input Comment/Notes into the order page and in the Standard Woocommerce Email confirmation as well.