Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we will not take payment for product purchases until order acceptance ( see below ) . 

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