Authors like Haribhadra, Somdeva and Ashadhara have written about them. The samanya dharma applies to Jains and non-Jains alike. For worldly affairs, Jainism does not automatically reject worldly practices. The worldly practices are acceptable to the Jains, provided they do not cause loss to samyakatva or corruption of the vratas.
Marriage is largely a worldly event.
The ritual of marrriage is largely governed by the traditional practices that may vary for different Jain communities. Marriage is a public declaration of a couple's intent to be together for life, and is a declaration of the community's support for the couple. Both of them include the use of fire. Note that the order may vary somewhat. Preferrably Jain marriage should be conducted by a Jain Pandit.