Based on your organization settings and role permissions, only the last two digits of the gift card number is visible and the remainder of the gift card number is masked with an '*' .
If the number is masked, clicking the Use this link does not populate the card number, but opens a field for you enter the gift card number. In such cases, either the guest must provide the number, or you must contact a staff member who has permission to view the complete number (by default, the owner role has the permission enabled).
Note: If the guest or owner cannot provide the number, the gift card cannot be redeemed.  
Example:
The following image is an example of masked gift cards. Click the Use This link beside a gift card number.

A field to enter the card number appears.

Enter the complete card number in the field and click Apply.

The card information automatically appears in the Card # fields.

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