Question: Should `combination` be a string? I just created some test locks of type ABC and the results are wrong;
{"lockID":1548621080,"lockedBy":"Zoe","timestampLocked":1548621080,"timestampUnlocked":1548622082,"status":"UnlockedFake","combination":0},{"lockID":1548621080,"lockedBy":"Zoe","timestampLocked":1548621080,"timestampUnlocked":1548622102,"status":"UnlockedReal","combination":3},{"lockID":1548621080,"lockedBy":"Zoe","timestampLocked":1548621080,"timestampUnlocked":1548622112,"status":"UnlockedFake","combination":8}
The combinations are U44UD6B3, 3STFTKE6, 8LWU7QBH so it looks like the value returned by the API is the leading digits(if any). (U...->0; 3S...->3; 8L...->8 ).
EDIT: It should probably be a string even for numeric combinations 'cos leading zeros need to be preserved.