[Bambora] How is «MD5 Key» used?

The MD5 key is used to stamp data sent between Magento and Bambora to prevent it from being tampered with.
The MD5 key is optional but if used here, must be the same as in the Bambora administration.

1. Bambora\Online\Helper\Data::calcEpayMd5Key()

2. Bambora\Online\Controller\Checkout\Callback::validateCallback()

3. Bambora\Online\Controller\Epay\Callback::validateCallback()

See also: