Magento 2.3.5-p2 3D Secure to Braintree not working Too many decimal places in amount field

Question

I am having a problem getting 3DSecure to work on my site. I get the following error. The JSON request I am getting back a 422 error from api.braintree.com

{
   "error":{
      "message":"Amount can be any number of digits optionally followed by a decimal point `.` and up to two decimal places following the decimal point. Commas `,` are not allowed."
   },
   "threeDSecureInfo":{
      "liabilityShifted":false,
      "liabilityShiftPossible":false
   }
}

This is the request data

{
   "_meta":{
      "integration":"custom",
      "integrationType":"custom",
      "merchantAppId":"xxxx.com",
      "platform":"web",
      "sdkVersion":"3.48.0",
      "sessionId":"3df9a6aa-46d1-494b-bff3-7a850a6ff13d",
      "source":"client"
   },
   "additionalInfo":{
      "billingCity":"xxxx",
      "billingCountryCode":"xx",
      "billingGivenName":"xxx",
      "billingLine1":"xxxxx Road",
      "billingPhoneNumber":"xxx-xxx-xxxx",
      "billingPostalCode":"xxxx",
      "billingState":"xx",
      "billingSurname":"xxxx",
      "shippingCity":"xxxx",
      "shippingCountryCode":"xx",
      "shippingGivenName":"xxxx",
      "shippingLine1":"xxx Road",
      "shippingPhone":"xxx-xxx",
      "shippingPostalCode":"xxxx",
      "shippingState":"xxx",
      "shippingSurname":"xxxx"
   },
   "**amount":12.0499**,
   "authorizationFingerprint":"eyJ0eXAiOiJKV1QiLCJhbGciOiJFUzI1NiIsImtpZCI6IjIwMTgwNDI2MTYtcHJvZHVjdGlvbiIsImlzcyI6Imh0dHBzOi8vYXBpLmJyYWludHJlZWdhdGV3YXkuY29tIn0.eyJleHAiOjE1OTYyMTA2NDQsImp0aSI6IjcxNTQxYzA0LTZkNDItNDlhZi1iODc2LTBmZjA1ZWEwNDRhMSIsInN1YiI6ImJqcXY3cGpqbXJrajc4cHIiLCJpc3MiOiJodHRwczovL2FwaS5icmFpbnRyZWVnYXRld2F5LmNvbSIsIm1lcmNoYW50Ijp7InB1YmxpY19pZCI6ImJqcXY3cGpqbXJrajc4cHIiLCJ2ZXJpZnlfY2FyZF9ieV9kZWZhdWx0IjpmYWxzZX0sInJpZ2h0cyI6WyJtYW5hZ2VfdmF1bHQiXSwic2NvcGUiOlsiQnJhaW50cmVlOlZhdWx0Il0sIm9wdGlvbnMiOnsibWVyY2hhbnRfYWNjb3VudF9pZCI6ImxlZHJvcGVsaWdodHNDQUQifX0.naHfA02qt5clJXYGGg7xxTfKKdaJOMFR0NZCfDbTxUR_f6vk1skBe8BH0afOYpwXsEf4Iz8YGDy1an7vLN33sg",
   "braintreeLibraryVersion":"braintree/web/3.48.0",
   "clientMetadata":{
      "cardinalDeviceDataCollectionTimeElapsed":3,
      "requestedThreeDSecureVersion":"2",
      "sdkVersion":"web/3.48.0"
   },
   "dfReferenceId":"0_3767710b-425b-4ba7-83a1-6d72a4619ff4"
}

The problem is that Magento is passing amount":12.0499 which has 4 decimal places. The Braintree API is expecting only 2. My system is displaying the correct number of decimal places as 2 on the frontend. I am not sure how to force Magento to send only 2 decimal places?

Thank you for your help.

Answer 1

Yes, it is a bit of a hack job, but it is the only way I could figure out how to fix it.

Edit \vendor\magento\module-quote\Model\Quote\Address\Total.php

Change line 59 & 79 to

$amount = is_float($amount) ? round($amount, 2) : $amount;

This will force the precision of the amount calculated to be 2 instead of 4 which will allow 3DS to work correctly.

To note every time you upgrade Magento you need to apply this patch until something official gets released.

Hope this helps

Answer 2

Wondering whether you ever solved this. I was experiencing the same issue but only when using percentage-based promo codes. We are running Magento 2.4.0 and for braintree:

"name": "braintree/braintree_php", "version": "4.5.0", "name": "paypal/module-braintree", "version": "4.1.0",

Having spoken with Gene who build the Braintree module for M2 they have now supplied a patch for the fix. I am sure they will be rolling this into their next release.