Hello,

Would it be possible to add other items that can be used as a currency to buy vehicles? For example, I would like to use dog tags found on my server as an item to buy vehicles with. 

Short answer for your first question and not example, yes.

For long answer for example too, not 100% sure it would work, but pretty sure it would, just have to enter the Display Name of the item you want to use. Which would be the name of the item you see when clicking it in your inventory, so for HQM it'd be "High Quality Metal" and NOT the shortname.

You'd need to click the dog tags to figure out the display name for them.

Okay that is fantastic! So let me just make sure I understand using HQM as an example. If I want them to use HQM to buy vehicles with I'd need to set my config to the following:

"Purchase Prices": {
"High Quality Metal": {
"amount": 1000,
"displayName": "High Quality Metal"
}

Ah, apologies, I actually sort of mislead you on accident lol, the key for the dictionary will actually be the shortname, so instead it'd be:

"Purchase Prices": {
"metal.refined": {
"amount": 1000,
"displayName": "High Quality Metal"
}

For Generalized:

"Purchase Prices": {
"SHORTNAME": {
"amount": 1000,
"displayName": "DISPLAY NAME"
}

Sorry again for that mix-up, tried to help while at school and didn't fully explore its usage and mislead you in the process. Hope this helps and clears it up though.

So for your dog tags, it'd be the shortname for the item used for the dog tags, unless you're using literal dog tags since I think they added those at some point, otherwise use the shortname of whatever item is being traded, even if its a custom item, example being if you created a new currency of money that was in actuality horse poop but was skined to look like money and had a custom display name of "GigaBux". This would be the way to do it: 

"Purchase Prices": {
"horsedung": {
"amount": 1000,
"displayName": "GigaBux"
}