Editing of logos, images and other color aspects of your mobile pass can be done through the Colors and Images section.
A - Background Color
You can edit the background color of the the pass according to your color preference. Use HEX color values.
B - Label Text Color
This will be the color of your labels on your pass, for example, the label where the card value is indicated.
C - Value Text Color
You can change the color of the texts of the values of the labels that you have created.
D - Icon Image
The icon image appears in the Passbook and Lock Screen for iOS devices. The image should be at least 120px in width, regardless of height. PNG or JPEG files are allowed.
E - Logo Image
This is where you place the branding on the pass. It can be your client's logo. The accepted dimension is at least 100px in height and at least 400px in width. Bigger images may be shrunk down to fit the image into the image place holder of the logo.
F - Strip Image
Strip image allows you to liven up your pass design. The image dimension should be at least 640px wide but if a QR code is used on the front of the pass, the strip image will be cropped accordingly.