In my setting, outlined in this other thread here >>95835523
I have expanded upon traditional paladins. They can only be LG still (antipaladins can only be LE), but there is more nuance to their required behaviors. I place great emphasis on the "alignment as a cosmic struggle" thing but prefer the ninefold system over the trinary LNC one.

In place of a generic "code" there are multiple paladin orders, and these each have a Vult - a shortlist of rules and ideals. This is not an unthinking edict, but informs their motives and dictates how they may spend excess cash, downtime, and make hard choices. LG and LE Clerics may also belong to these orders, but they are less restricted. What is considered to be a Vult for a Paladin or Antipaladin, is a portion of the larger body of scripture for a cleric. Nevertheless, hardliner clerics can be roleplayed if a player so chooses.

Here are the example ones I have down

Order of the Hand
>Protect the innocent
>Heal the ill, no matter if they are friend or foe - so long as the latter truthfully agrees to surrender or truce.
>Recover magic and holy relics, they may be used to serve the Vult, fight evil or donated to Lawful Good religious purposed - Churches, clerics, other paladins - but not sold.
>Donate excess wealth to the church

Order of the Eye
>Root out evil in dark places
>Discover lost holy relics, and record them. If recovered, they may be used to serve the Vult, fight evil or donated to Lawful Good religious purposed - Churches, clerics, other paladins - but not sold.
>Provide confession for the troubled and record the good deeds of the virtuous
>Exorcise the unseen

Order of the Lily of the Valley (Antipaladin) (picrel)
>Discover new power and keep it out of the hands of others
>Kill with honor and grace, do not allow enemies to do the same
>Develop personal power through servitude and skillful training
>Make favorable deals, and hold others to their debts - Donate excess wealth to the order
>Bring glory to the order