person table
id | name | payroll_provider_id | company_id
------+------+---------------------+------------
[uuid]| john | 731273721 | [uuid]
https://en.wikipedia.org/wiki/Natural_key A natural key (also known as business key[1] or domain key[2]) is a type of unique key in a database formed of attributes that exist and are used in the external world outside the database (i.e. in the business domain or domain of discourse)
https://en.wikipedia.org/wiki/Primary_key Informally, a primary key is "which attributes identify a record," and in simple cases constitute a single attribute: a unique ID
https://en.wikipedia.org/wiki/Foreign_key A foreign key is a set of attributes in a table that refers to the primary key of another table
https://en.wikipedia.org/wiki/Surrogate_key A surrogate key (or synthetic key, pseudokey, entity identifier, factless key, or technical key[citation needed]) in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data, unlike a natural (or business) key.
primary & surrogate key| | natural key | foreign key
id | name | payroll_provider_id | company_id
-----------------------+------+---------------------+------------
[uuid] | john | 731273721 | [uuid]