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| == Issue ==
| | {{Migrating|https://smartpossdk.gitbook.io/cloudpossdk/faq/emv/resolve-detection-priority-conflict}} |
| In some instances, POS systems detect a contactless card before a chip card, even when attempting to process a chip transaction. To resolve this, follow the steps below:
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| == Step-by-Step Solution ==
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| # '''Enable Anti-Shake Function:'''
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| #* Before opening the reader, execute ''''emv_set_anti_shake(1)'''' to enable the anti-shake function.
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| #* Example: This can be done in the ''''readAllCard'''' method in ''''FuncActivity.java''''.
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| # '''Handle Contactless Card Found Event:'''
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| #* When a contactless card is detected, the ''''SMART_CARD_EVENT_CONTALESS_ANTI_SHAKE'''' event will be triggered.
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| #* The callback function will wait for 400 ms by default to allow for detection of other readers.
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| #* Implementation: This can be observed in ''''cardEventOccured'''' in ''''FuncActivity.java''''.
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| # '''Check MSR Read in Callback:'''
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| #* In the card event callback, specifically ''''case CARD_CONTACTLESS_ANTISHAKE:'''' in ''''RequestCardActivity.java'''', check if MSR is read.
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| #* Call ''''emv_anti_shake_finish'''' based on the MSR state. This method should also be called if a contact card is found (''''case CARD_INSERT_NOTIFIER:'''' in ''''RequestCardActivity.java'''').
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| # '''Restart Contactless Reader if Necessary:'''
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| #* If there’s an interaction error with the contactless card (''''case ERROR_PROCESS_CMD:'''' in ''''ProcessEMVCardActivity.java''''), restart the contactless reader.
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| #* Consider steps 1 and 2 if contactless is restarted (''''case CARD_CONTACTLESS_ANTISHAKE:'''' in ''''ProcessEMVCardActivity.java'''').
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| # '''Interrupt Contactless Transaction for Contact Card Insertion:'''
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| #* During a contactless transaction, if a contact card is inserted, interrupt the transaction before reading the application finishes. Then, restart the transaction with the contact card.
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| #* See ''''case ERROR_CONTACT_DURING_CONTACTLESS:'''' in ''''ProcessEMVCardActivity.java'''' for implementation details.
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| '''Note:'''
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| * These steps encompass the entire procedure for handling the issue of contactless detection taking priority over chip detection.
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| * For further guidance and example implementations, refer to the EMVSample documentation.
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