I found that using the "stripColor" does change the text in the strip outside of the "foregroundColor" parameter. This is still the case in iOS 8+
Here is example of where to put the "stripColor" in the json.
passJson = {
"formatVersion": 1,
"passTypeIdentifier": "pass type goes here",
"serialNumber": "serialNumber goes here",
"teamIdentifier": "",
"organizationName": "",
"description": "",
"logoText": "My Logo",
"foregroundColor": "rgb(150,0,150)",
"backgroundColor": "rgb(255, 255, 255)",
"labelColor": "rgb(0, 0, 0)",
"stripColor": "rgb(255,255,255)",
"associatedStoreIdentifiers": [
],
"associatedApps": [
{
"title": "Name of your app"
}
],
"barcode": {
"message": "coupon",
"format": "PKBarcodeFormatPDF417",
"messageEncoding": "iso-8859-1",
"altText": "coupon"
},
"coupon": {
"primaryFields": [
{
"key": "offer",
"label": "Offer text 2",
"value": "Offer text 1"
}
],
"secondaryFields": [
{
"label": "Expires",
"value": "09/26/2015",
"key": "expires"
}
],
"backFields": [
{
"label": "TERMS AND CONDITIONS",
"value": "Back of pass",
"key": "terms"
}
]
}
}