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Often times, buyers may not know how to input data in a valid format. For example, your site may display a phone field where the required format is only numbers and spaces (408 555 1212). The buyer may try entering their information in various other formats (408.555.1212, 408-555-1212). While you can choose to not set field validation rules so that any format will be acceptable, you may need to accept information in a certain format if you are processing the information through a third party system for order management or other purposes.
In cases where you have set field validation, Checkout & Registration Manager allows you to provide field help text to guide buyers as to the acceptable formats.