contract crypto service

### POST /api/address [CREATE ADDRESS]

==== REQUEST ====
{
    referenceId: xxxx, 
    coing:"BTC"
}

==== RESPONSE ====
{
    referenceId: xxxx, 
    address: xxxxx,
    coing:"BTC"
}

### GET /api/address?referenceId=xxxx [LIST ADDRESS BY REFERENCE]

==== RESPONSE ====
{
    referenceId: xxxx, 
    coins:[
        {
            address: xxxxx,
            coing:"BTC"
        },
        {
            address: xxxxx,
            coing:"ETH"
        }
    ]
}



### WEBHOOK (POST) / MESSAGING [SEND DATA TO MAIN APP]

{
    referenceId:xxxx,
    amount:xxx,
    coin: BTC,
    confirmation: xxx
}