Need help integrating 2checkout with ModernBill

I am in need of assistance with integrating 2checkout with modernbill.

The customers are able to fill in all their information, but as they go to the payment button, it goes to 2checkout website saying this:

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Parameter Error

Incorrect parameters were supplied, therefore this purchase cannot begin.

If you are attempting to purchase from a web site please contact the web site so that they can correct the error.
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All the information in my modernbill is correct for the 2checkout.

Can anyone please help?

 

 

 

 

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