 #include "VendingMachineRFID.h"
 
 /* Hack to fix sizeof(card_uid_t) sometimes becoming 5 (?) */
-#define CARD_UID_SIZE 4
+// #define CARD_UID_SIZE 4
+// Caused by Stream.parseInt();
 
 MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
 uint32_t lastCardScan; // Debounce RFID reads
 uint32_t timeBetweenScans;
+
+uint16_t credits_in_machine;//Serial.parseInt();
+char parseBuffer[2];
 
 void setup() {
   uint32_t lastCardScan = 0;

          card.credits = 0;
        } else { // Known card
          // Fetch current credits
          uint16_t four = 4;
          uint16_t credit_addr = addr+4;
          //Serial.print("Z ");
          Serial.println(addr,DEC);
          Serial.println(addr+4,DEC);
          Serial.println(addr+four,DEC);
          //Serial.print(" + ");
          //Serial.print(CARD_UID_SIZE);
          //Serial.print(" = ");
          Serial.println(credit_addr);
          credit_addr = addr+four;
          Serial.println(credit_addr);
          EEPROM_readAnything(credit_addr,card.credits);
        }
        card.credits += credits_in_machine;
        // Card found! (Known card OR found free spot for new card)

        } else { // Known card!
          // Card found!
          // Withdraw from card
          EEPROM_readAnything(addr+sizeof(card_uid_t),card.credits);
          if(card.credits == 0){
            // ERR Beep + display "NO CREDITS"?
            Serial.println("NO CREDITS - KNOWN CARD");
