Hi, thanks for posting an interesting project.
Looks like you want to create a trade automation tool using email notifications.
We can simply use Gmail webhook API to catch incoming emails and some regex to parse the data inside it.
Then Oanda has a really good RESTful api, we can easily perform trade execution requests there and attach data from gmail easily.
We can run the webserver on any language, For this one I think the PHP will be good :)
I'm an experienced web developer working on fast and fully automated bots and I think I can help you out with the project.
Please send a message and let's discuss further.
Looking forward to working with you.
Thanks.
Giorgi.