How to use

All endpoints require an API Key which can be found inside your account. You will want to make sure to always submit requests with the `Authorization` header. Example

var apikey = 'YOUR API KEY';
xhr.setRequestHeader('Authorization', 'Bearer ' + apikey);

Here are the endpoints to interact with the gift card API.

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/api/cards/balance GET

INPUTS
`sku` The sku of the card you are requesting for a balance. You can comma seperate skus to get up to 100 cards at a time.

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/api/cards/charge POST

INPUTS
`sku` The sku of the card you are requesting to charge.
`amount` The amount you wish to charge against the balance of the card.

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/api/transactions/refund POST

INPUTS
`id` The id of the transaction you are requesting to refund.
`amount` The amount you wish to refund back to the balance of the transaction.