Error 3501 indicates issue with Fyers API V3 setup in APIBridge.
To trade with Fyers using the APIBridge desktop application, follow the steps given below.
STEP 1: Change to Default Mode.
STEP 2: Go to APIBridge Settings -> API Settings
In first field (PIN/DOB) put your 4 digit Fyers account PIN
In second field put Fyers client login ID
In third field put Hash Key Generated from Fyers Web Account or upload the QR code image.
Click Save and exit from settings.

STEP 3: Click on Login to API
Fyers API Features
Feature | Details |
Cost | Free |
Auto Order Cancellation | YES |
MaxProfit/MaxLoss | YES |
SLL, SLM Orders | YES |
CO | YES |
BO | YES |
Trail SL in BO | NO |
MCX Futures | YES |
NSE Currency | YES |
NSE Weekly Options | YES |
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