Unpaid Internship while on OPT

[Bhajagovindam]

Hello everyone:

 

My current employer want to file GC and they've asked for all previous employment letters and I've a question below:

 

I worked as Data Analyst (unpaid intern) for 6 months while I was on OPT between Sep-2010 and Jan-2011. We had an agreement that time that company has done investment in Corporate trainings related to my degree along with Hotel stay.

 

Is it acceptable to submit a letter stating Data Analyst (unpaid intern) because I didn't got paid?

 

Thanks

B.Govindam.