[bArray]

It was either PCBWay or JLCPCB, but they had a "review window" where it was possible to make changes or cancel an order. They recently switched this to be an automated review, so there was no opportunity for corrections. It could be that the card companies blacklisted them after people started cancelling orders with their credit cards, because their UI stopped supporting the feature.

[Liftyee]

Ordered from JLC a few weeks ago, their "review" is still manual. You can select a "confirm production file" option to get a second chance too.

[crote]

Don't they have a rather exhaustive self-service review UI on submission? Allowing people to cancel after they already verified exactly what they were getting seems a bit excessive, no?

[greyface-]

I will review a board a dozen times, find no issues, submit it for production, then 5 minutes later discover an obvious bug. Characterize it how you will, the cancellation window has saved my bacon more than once.

[bArray]

Exactly this. You calm down, take a cup of coffee, marvel at your beautiful design, and then spot something out of place. The actual review has saved me a few times too, for example: "are you sure there are no copper layers in your PCB design?" - Doh! A few times they have raised issues regarding the limitations of their manufacturing capabilities, and this too has saved time and cost.