If both bride & groom are Hindus by religion , of legal age i.e. bride 18years & groom 21years, both are unmarried or not having a living spouse at the time of marriage, both are not related to each other by a relationship of prohibited degree or Sapinda relationship, both are mentally fit & not suffering from any mental illness, then whether their marriage took place by the consent of their parents or not, whether they married according to Arya Samaj Hindu rites or Sanatan Dharam Hindu rites for all purpose their marriage is legal & valid in the eye of law.
How legal is arya samaj temple marriage
As far registration of such marriage under section 8 of the Hindu Marriage Act,1955 is concerned in case such marriage is not got registered such non registration will not invalidate such marriage, this the law upto today, but according to latest direction of the Supreme Court of India few months back, it has been directed to all the States in India to make registration of any marriage preformed in any State of India compulsory to the extent that incase such marriage is not registered it will not be considered legal or valid after coming of such amendment in the various matrimonial laws enacted by all the religions including this Hindu Marriage Act,1955.
So if you got married under this Arya Samaj Mandir then get this marriage registered under section 8 of the Act by the Marriage officer/Registrar (usually Tehsildar or SDM of the district) of the district/state, where this marriage took place. For this you will be requiring the age proof of both, address proof of both & proof of marriage in form of marriage certificate issued by the priest or the temple where it was preformed, photograph of this marriage, wedding card ,one or two or four witnesses of such marriage depending on the place (state or district) of such marriage e.g.
in Delhi you require only one Gazetted officer as witness but in UP you require two witnesses but in Haryana they may ask you four witnesses one each close relative for both & one each more for both. This a brief legal position in India for both your questions asked here.