in-Browser Credit Card Processing Failures

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Description

When trying to do "cross-domain" credit card transactions (primarily with 3rd party card approvers for crypto wallets - portis & metamask) the transactions fail.

Steps to Reproduce

try to initiate crypto buys via beta.shapeshift.com and or via Dissenter Metamask "buy" function.

Actual result:

Rejections, Failures, Error Re-directs

Expected result:

Successful Debit Card Transactions (completed successfully, moments later, via Firefox on same desktop)

Reproduces how often:

tried, several (a dozen?) times and failed rigorously...

Brave version (brave://version info)

Version 1.5.114 Chromium: 80.0.3987.149 (Official Build) (64-bit)

Ubuntu 20.04 - Linux AMD64

Version/Channel Information:

Dunno...

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NO
• Does the issue resolve itself when disabling Brave Rewards? NO
• Is the issue reproducible on the latest version of Chrome? DUNNO

Miscellaneous Information: