You may get .psd* file of "Platinum Credit Card design" Photoshop tutorial by making a donation. Put the tutorial title in "Add special instructions to seller" line of PayPal and it will be sent to you shortly.
- Merge original and duplicated layers.
- Duplicate created layer. Opacity 30 - 40 %.
- Transform it. Choose Edit > Transform > Flip vertical. Move it down.
- Correct the form using Distort transformation.
- Add Vector Mask, fill it with linear White/Black Gradient.