Building the Pass
A pass will typically be built by an automated server. This section and the next section of the chapter describe building a pass manually so that the steps necessary are clear; automating the process would depend on the choice of server environment and is left as an exercise for the reader.
Several steps are required to build a pass. Apple recommends creating a folder to hold all the files required for an individual pass, for example, a folder called Boarding Pass.raw.
Place all the required and desired images in the pass folder. Passes support retina and nonretina versions of images using standard “@2x” naming syntax. The images that need to be provided are these:
icon.png (required): A 29×29-pixel PNG image (and retina version), ...
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