Step 1: To identify the pattern, observe the shifts in each letter of the word BANKER to form LFSCBO:
- B to L: Shifted by +10 letters.
- A to F: Shifted by +5 letters.
- N to S: Shifted by +5 letters.
- K to C: Shifted by -8 letters.
- E to B: Shifted by -3 letters.
- R to O: Shifted by +3 letters. Step 2: Apply the same shifting pattern to the word CONFER:
- C to G: Shifted by +10 letters.
- O to F: Shifted by +5 letters.
- N to S: Shifted by +5 letters.
- F to D: Shifted by -8 letters.
- E to P: Shifted by -3 letters.
- R to O: Shifted by +3 letters.
Thus, the code for CONFER is \( \boxed{GFSDPO} \).