fix: pin data field format

Author: kalinkrustev

iso8583.fields.json

@@ -54,7 +54,7 @@
     "49":   {"size": 3  , "name": "CURRENCY CODE, TRANSACTION", "format": "string"},
     "50":   {"size": 3  , "name": "CURRENCY CODE, SETTLEMENT", "format": "string"},
     "51":   {"size": 3  , "name": "CURRENCY CODE, CARDHOLDER BILLING", "format": "string"},
-    "52":   {"size": 8  , "name": "PIN DATA", "format": "binary"},
+    "52":   {"size": 16 , "name": "PIN DATA", "format": "string"},
     "53":   {"size": 16 , "name": "SECURITY RELATED CONTROL INFORMATION", "format": "numeric"},
     "54":   {"size": 120, "name": "ADDITIONAL AMOUNTS", "format": "string", "prefixSize":3},
     "55":   {"size": 999, "name": "RESERVED ISO", "format": "string", "prefixSize":3},
@@ -320,7 +320,7 @@
     "49":   {"size": 3  , "name": "Currency code, Transaction", "format": "string"},
     "50":   {"size": 3  , "name": "Currency code, Reconciliation", "format": "string"},
     "51":   {"size": 3  , "name": "Currency code, Cardholder billing", "format": "string"},
-    "52":   {"size": 8  , "name": "Personal identification number [PIN] data", "format": "binary"},
+    "52":   {"size": 16 , "name": "Personal identification number [PIN] data", "format": "string"},
     "53":   {"size": 48 , "name": "Security related control information", "format": "binary", "prefixSize":2},
     "54":   {"size": 120, "name": "Amounts, additional", "format": "string", "prefixSize":3},
     "55":   {"size": 255, "name": "IC card system related data", "format": "binary", "prefixSize":3},