Are Custom Mappings always two-way?
The custom mappings will sync in the direction you have set up in the configuration of your connection, so this could be two-way or one-way.
However, there are some exceptions where a custom mapping can only sync one-way:
When certain contact fields are not allowed to be modified through a third-party (PieSync).
- When we can only read or push from and to a certain field.
Below is an example of a field that can't be modified through a third-party and therefore only syncs one-way (→).
Bear in mind that, when you have your connection configured in the other direction (←), that direction will win.