v2.0: Adding verizon.net to list of domains that enforce DMARC.
v2.0: API change to allow guest customers to be added to cart resources.
v2.0: API change to show certain transaction errors for API-initiated charges in the store error log.
v2.0: Improvement to better handle expired SSO tokens with hosted payment page redirects.
v2.0: Improvement to CyberSource auth-verify and void handling, to pass through the correct CyberSource ID.
v2.0: API change to remove the refund link rel if the transaction status is authorized.
v2.0: Fix to Apple Pay verification file handling.