The getData() method returns the base path, where the data has been saved (basePath), the JSON manifest in its entirity (original), the initially loaded items (initialLoad) and finally any items that are being lazy loaded (lazyLoad).
// Save all PSD data to a variable
const psdData = this.P2P.getData("psd_key");
// "basePath" is where the PSD data is stored.
const psdPath = psdData.basePath;
// "original" is the entire JSON blob.
const psdWidth = psdData.original.width;