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First and foremost - please be in touch with your web developer!
The gateway on our side will be switched to only accept V2 3DS transactions on 5th September, so please ensure any direct integrations are updated to align with this
Pages of the Integration Guide which are relevantwill be of assistance:
39
41-55
93
124-125
228-237
323-326
These are shown below for ease;
Page 39
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Pages 41-55
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Page 93