Finding the Required Kits
To begin, locate the DNA Workbench Kit, Helping Hands Kit, and Soldering Station Kit. These can primarily be found in industrial buildings and cargo containers. Once all three are collected, you can combine them to place a blueprint.
 

Gathering & Crafting Materials
Next, find and/or craft the following materials:
16 Bolts
13 Wood Planks
5 Sheet Metal
1 Metal Wire
1 Card Reader
1 Laptop.
 

Making the Keycards
Finally, you will need a 40V Battery, Flux, and Solder to be able to craft the keycards.

Please refer to the linked video below for a step-by-step guide on crafting the keycards.