WHMCS Addon Development

Using the WHMCS Internal API - https://developers.whmcs.com/api/internal-api/
We need an Addon Module developing: https://developers.whmcs.com/addon-modules/
We are using WHMCS v8.3.2

This Addon Module will be called: "MTH Tools" - This should be the title at the top of the page.
The first part of the page, should have the sub-title of: OFNL Maintenance Report - with an upload button that should accept the upload of a CSV (sample will be given on job start).

Once the CSV is uploaded, each line is a new address that has some works to be completed. This should be displayed in a table and each line should be matched to its client ID, to do this - in the CSV there is a field called FIN - we will match this to the "customfields" called "OFNL-FIN" in our WHMCS.

Any that are unable to be matched to their client ID should be flagged and manually input client ID and Product ID. The FIN Number (in the CSV) should then be imported to the product ID (as this is what we use for matching).

Once all addresses are matched, we should press "next" and be taken to the next screen
On this screen, we should enter:
- Reference
- Start Time
- End Time
- Type: Emergency / Standard
- Description

The description is OPTIONAL, the rest are MANDATORY

One the above is complete, we should hit SUBMIT - which should go through each client and raise a ticket on their account using the internal WHMCS API call "OpenTicket"
https://developers.whmcs.com/api-reference/openticket/

Action - OpenTicket
DeptID - this should be set in the WHMCS addon settings
Subject - This should be set based on the "Type"
Message - This should use a template based on the "Type"
ClientID - this should be the ClientID that has matched

Once the above process has completed, we should display the results and the support ticket IDs before dismissing the process. Once the tickets are opened there is no need to save the CSV process and we can destroy this at the end after success.