Example: Fuel Station Flow

{
"command": "cardDetect",
"requestId": "fuel-001",
"data": {
"amount": 50000,
"tranType": 1,
"channels": ["CTLS", "CHIP", "SWIPE"]
}
}

{
"command": "displayConfirm",
"requestId": "fuel-002",
"data": {
"title": "Choose Payment Method",
"yesLabel": "Pay at Pump",
"noLabel": "Pay in Store",
"yesImage": "payatpump",
"noImage": "payinstore"
}
}

{
"command": "displaySelect",
"requestId": "fuel-003",
"data": {
"title": "Select Fuel Type",
"options": [
{"tag": "87", "label": "Unleaded 87"},
{"tag": "89", "label": "Unleaded 89"},
{"tag": "DSL", "label": "Diesel"}
],
"showTags": true
}
}

{
"command": "authorize",
"requestId": "fuel-004"
}

{
"command": "displayScreen",
"requestId": "fuel-005",
"data": {
"title": "Fueling...",
"mediaId": "fueling",
"fitImage": "FULL",
"loop": true
}
}

{
"command": "settle",
"requestId": "fuel-006",
"data": {
"transactionId": "TXN-20260113-004000",
"amount": 7850
}
}

{
"command": "print",
"requestId": "fuel-007",
"data": {
"printData": "Fuel Receipt\nUnleaded 87\n15.7 gal @ $5.00/gal\nTotal: $78.50"
}
}