Generally a documentary bill payable on demand tendered for purchase shall consist of the following: 

• A Sight draft of the drawer to the value of the invoices of the respective goods consigned. 
• Documents of title to goods covered by the bill viz. (a) Railway Receipt or (b) Lorry Receipt of an approved carrier or (c) Bill of Lading (Inland). 
• Invoices or contract notes of Bills of sale in respect of the goods covered by the documents. 
• Transit Insurance Policies, if they have been taken.

Usance Bill is the one which is expressed to be payable after a specified period (Usance) mentioned in the bill. Usance bill may be a clean bill or may be

• accompanied by documents of title to goods evidencing dispatch of goods (Railways Receipt/Lorry receipt/ shipping documents)
• Usance Bill of Exchange

• Original Invoice
• Undertaking from the Corporate Buyer agreeing to route the sales proceed to our bank
• Guarantee / Comfort letter from the corporate buyer
• Details of monthly / yearly sales to the buyer