Sec.91 crpc - summons employer to submit salary information in maintenance case

Yes, your wife can seve summon to employer to give your salary details in this case. Employer need to provide to the court the documentary evidence of your salary that you reciept. Please, note that if your wife is working lady she cannot claims so the maintainance on various grounds.Please, check up with your lawyer with valid rullings.

You can save yourself from MAINTENANCE IN three situation

1. Dissertation happened from  wife side ( usually RCR with help if you filed it before or even now) - Rajasthan High court decision 

2. your wife is highly qualified and working professional ( CA / Engineer) - Delhi high court decision 

3. if you can put up sufficient material of her adultery ( but it is quite backfiring tool- not advisable to test it ) - A long year separation may be valid reason and argument for such scenario ( some decisions are there)

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Show your maximum liabilities to minimize the grant of maintenance ( delay it with all means) 

1. show your responsibility of old parent,younger unemployed sister/brother or grand mother 

.2 housing loan  etc personal loan (agar nahin liya hai to le lo ) 

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In your instant case and as updated, on the court serve the summon you or the comnpany need to gives the details of your salary towards compliance to the court summon. The rest what you have decided to continue her or desert her or get serperated her all depends on you and how you react and face.