This endpoint will be used to create a raw transaction that spends from a P2PKH address and that supports paying to mulitple addresses (either P2PKH or P2SH). The endpoint should return a transaction that spends from the source address and that pays to the output addresses. An extra output for change should be included in the resulting transaction if the change is > 5430 SAT.

• Path: /payment_transactions
• Method: POST
• Request Body:

{
    source_address (string): The address to spend from
    outputs (dictionary): A dictionary that maps addresses to amounts (in SAT)
    fee_kb (int): The fee per kb in SAT
}

• Response Body:

{
    raw (string): The unsigned raw transaction
    inputs (array of dicts): The inputs used
    {
        txid (string): The transaction id
        vout (int): The output number
        script_pub_key (string): The script pub key
        amount (int): The amount in SAT
    }
}

• Example:

curl -X POST \
  http://localhost:5000/payment_transactions \
  -H 'Content-Type: application/json' \ 
  -d '{
        "source_address": "3E1WB5Y7jxDPT428A3Si6g94L9j7Rt2vt4",
        "outputs": {
                "1HCuHELi5PX8mnLTSkPv27T48K4ig4CJUP": 9999
        },
        "fee_kb": 2500
}'

• Install packages and run:

make start

OR

make install-packages
make run

• Run:

make docker

OR

make docker-build
make docker-run

• Stop:

make docker-stop

• Install test packages:

make install-test-packages

• Run tests:

make test

make help