PB Shipping API Special Services

Special Service ID
Special Handling 36
Certified 37
Delivery Confirmation - No Signature 38
Delivery Confirmation - Signature Required 39
Delivery Confirmation - Adult Signature Required 40
Delivery Confirmation - Signature Waiver 42
Registered 54
COD - Any 55
Insurance 61
Restricted Delivery 66
Return Receipt 76
Disposition Method - Return 116
Disposition Method - Abandon 117
Disposition Method - Redirect 118

See full PB Shipping API (CarrierID=106) Reference.