Plugin for Joomla. How to make it?

Question

Joomla

you need to write a plugin that will create mail forms. The principle of operation is as follows: next to each order there is an icon of mail blanks, click select the required form and it opens in a new tab with data from the order.
It should work on joomla + virtuemart. Order
forms will have to be on our host, and before creating each form, we must check for the presence of a key for the plugin, the
plugin needs to be wrapped in an installer so that it can be placed
on any site
Russian mail forms
joomla 3.7.4
virtuemart VirtueMart 3.2.2
here is the site where the forms are: https://pbrf.ru/
need F7 F.116
F.112 in f7 there is more choice How to do it all and where to start?

Answer 1

From the publication of the order on the freelance platform https://freelansim.ru