Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if payment is not received by us from the payment method you provided , you agree to pay all amounts due upon demand by us . 

```
. OPTIONS: ['Arbitration' 'Content removal' 'None' 'Choice of law'
 'Unilateral termination' 'Contract by using' 'Jurisdiction'
 'Limitation of liability' 'Unilateral change'].