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Ryan Adams 173 Initial create a validation rule to check that a contact is in the zip code of its account.
What is the starting point for this challenge? Is it necessary to first create custom fields for MailingPostalCode and ShippingPostalCode (as these to not seem to exist already)?
These are the standard fields of standard contact Sobject.
When you click on the validation rules under setup -- customize -- contacts.
You can see the insert fields option where you can find these fields.
https://help.salesforce.com/articleView?id=contacts_fields.htm&language=en&type=0
Hope this helps you!
If this helps you, please mark it as solved.
Thanks and Regards
Sandhya