buy.sh

my_act=<Your account goes here>
coffee_act=gnqjB9vj9onfw9g9zeyLMqyLDkuJ6Xf69R

my_sec=<your secret goes here>

curl -X POST https://live.stellar.org:9002  -d "
    \"method\": \"submit\",
    \"params\": [
        {
            \"secret\": \"$my_sec\",
            \"tx_json\": {
                \"Account\": \"$my_act\",
                \"TakerPays\": {
                    \"currency\": \"COF\",
                    \"issuer\": \"$coffee_act\",
                    \"value\": 1
                },
                \"TakerGets\": \"750000000\",
                \"TransactionType\": \"OfferCreate\"
            }
        }
    ]
}"

trust.sh

my_act=<Your account goes here>
coffee_act=gnqjB9vj9onfw9g9zeyLMqyLDkuJ6Xf69R

my_sec=<your secret goes here>

curl -X POST https://live.stellar.org:9002  -d "
{
    \"method\": \"submit\",
    \"params\": [
        {
            \"secret\": \"$my_sec\",
            \"tx_json\": {
                \"Account\": \"$my_act\",
                \"LimitAmount\": {
                    \"currency\": \"COF\",
                    \"issuer\": \"$coffee_act\",
                    \"value\": 100
                },
                \"TransactionType\": \"TrustSet\"
            }
        }
    ]
}
"