How to retrieve AFL from mastercard?

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I'm trying to read some data like track 2 from mastercard contactless. But the PDOL not returned after select AID command, so how can I construct GPO to read AFL? to initiate read records comnand. If there is any advice?

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user3770585 On

I trird to send GPO command without PDOL like this: "80A80000028300" and then I can read AFL in response.