Access Private Network from Droplet

Hello community,

I have the following challenge I would appreciate any help,

I created a Droplet in Digital Ocean which I will use as a Back-End Server for an application, this server requires to connect to a database that is hosted by another provider. Of course The Droplet does not reach the database server as it is inside a Private Network.

What would be the best approach for this?

I contacted the provider that hosts that database and they told me: “We can configure an additional point-to-point VPN, would only require your new endpoint IP, internal subnet and I can send you the private shared key and the encryption parameters”

I’m wondering, Do I need to configure a PPTP? What’s my endpoint IP? Is that the Public IP of the droplet? What’s my internal subnet? Do I require a VPC for this?

And what would I do with the private shared key, given by the provider?

I know it’s specific but any help would really really help!

Thanks!