I have a transaction ID, how do I get the order ID of that transaction from it?

[sty5]

I have a transaction ID, how do I get the order ID of that transaction from it?

[kernowlass]

@sty5 

Ask the merchant you purchased from or check their confirmation email if they sent one?

[sty5]

I am the merchant. I have the transaction ID for someone that bought from me and Im trying to find the corresponding order ID.