# Function Menu

- JSON Key is`function`, only in Response message

<table id="bkmrk-field-type-mandatory"><thead><tr><th style="width: 106px;">Field</th><th style="width: 116px;">Type</th><th style="width: 95px;">Mandatory</th><th style="width: 175px;">Description</th><th style="width: 317px;">Memo</th></tr></thead><tbody><tr><td style="width: 106px;">iconUrl</td><td style="width: 116px;">String</td><td style="width: 95px;">Yes</td><td style="width: 175px;">icon URL</td><td style="width: 317px;">variable-length field</td></tr><tr><td style="width: 106px;">title</td><td style="width: 116px;">String</td><td style="width: 95px;">Yes</td><td style="width: 175px;">Function Name</td><td style="width: 317px;">variable-length field</td></tr><tr><td style="width: 106px;">action</td><td style="width: 116px;">String</td><td style="width: 95px;">Yes</td><td style="width: 175px;">Function Action</td><td style="width: 317px;">variable-length field</td></tr><tr><td style="width: 106px;">command</td><td style="width: 116px;">String</td><td style="width: 95px;">Yes</td><td style="width: 175px;">Commands in Menus</td><td style="width: 317px;">Such as:04|00|Please Swipe card|1|08|00|Product XXX(M)$HDCP00000000072578|0|</td></tr><tr><td style="width: 106px;">childrenFunc</td><td style="width: 116px;">List&lt;[function](https://book.e-buy.com/books/e-buy/page/function-menu)&gt;</td><td style="width: 95px;">No</td><td style="width: 175px;">Nodes in Menus</td><td style="width: 317px;">variable-length field</td></tr></tbody></table>