We'd like to discuss the term of payment in more detail. 

我们想讨论一下付款条件的细节。 

 

Let's discuss the contract item by item. 

让我们逐条来讨论这份合同。 

 

There are some points that need to be worked out. 

还有几点需要研究一下。

 

 

discuss the contract (讨论合同) 

 

Tip:在签订合同，双方都应谨慎仔细，认真讨论合同每个细节，item by item就是一条接一条，逐条的意思，类似有 one by one(一个接一个)。讨论过程中可能用的句型: What do you think? In my opinion. Are satisfied with...等。