Buy orders require the following mandatory fields:

account_reference: the customer's unique ID in our system
purchase_reference: the customer's order ID you want to reference in your system
source: a supported fiat currency e.g. USD
source_amount: fiat currency amount NFT is listed in
target: cryptocurrency NFT is listed in e.g. ETH
wallet_address: the address associated with the cryptocurrency being purchased
return_url_on_success: used to return the customer to your website once the order is completed
meta_data nfts: used to display NFT name, image and collection name

When an order is ready to be completed by the customer, you will receive the following:

Field	Description	Format
`data.order.id`	Unique ID for the the order	string
`data.order.account_id`	Banxa generated account ID for the customer and linked to the customer reference provided by you	string
`data.order.account_reference`	Unique customer reference provided by you	string
`data.order.order_type`	Order type. Indicates whether the order is a sell or buy crypto order	string
`data.order.fiat_code`	Fiat currency code	string
`data.order.fiat_amount`	Fiat currency value	decimal
`data.order.coin_code`	Cryptocurrency code	string
`data.order.coin_amount`	Cryptocurrency value	decimal
`data.order.wallet_address`	Cryptocurrency wallet address	string
`data.order.blockchain`	Blockchain network used for the cryptocurrency	array
`data.order.blockchain.code`	Blockchain code	string
`data.order.blockchain.description`	Blockchain name	string
`data.order.created_at`	Timestamp of order creation in UTC	string
`data.order.checkout_url`	URL that redirects customer to Banxa checkout	string