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# Implementation

The following guide provides a steps-by-step breakdown of Pacifica's signing implementation

###
1. Setup and Initialization:

    import time
    import base58
    import requests
    from solders.keypair import Keypair

    PRIVATE_KEY = "your_private_key_here"

    # Generate keypair from private key
    keypair = Keypair.from_bytes(base58.b58decode(PRIVATE_KEY))
    public_key = str(keypair.pubkey())

###
2. Choose Endpoint and Define Operation Type

For this example, we use the order creation endpoint. Refer to Operation Types
for a list of all types and corresponding API endpoints.

    API_URL = "https://api.pacifica.fi/api/v1/orders/create"
    operation_type = "create_order"
    operation_data = {
        "symbol": "BTC",
        "price": "100000",
        "amount": "0.1",
        "side": "bid",
        "tif": "GTC",
        "reduce_only": False,
        "client_order_id": str(uuid.uuid4()),
    }

###
3. Create Signature Header

Note that all times specified are denoted in milliseconds. The `"expiry_window"` field is optional, and defaults to 30_000 (30 seconds) if not specified in the header.

    # Get current timestamp in milliseconds
    timestamp = int(time.time() * 1_000)

    signature_header = {
        "timestamp": timestamp,
        "expiry_window": 5_000,
        "type": "create_order",
    }

###
4. Combine Header and Payload

    data_to_sign = {
        **signature_header,
        "data": operation_data,
    }

In the case of our example, this creates:

     {
         "timestamp": 1748970123456,
         "expiry_window": 5000,
         "type": "create_order",
         "data": {
             "symbol": "BTC",
             "price": "100000",
             "amount": "0.1",
             "side": "bid",
             "tif": "GTC",
             "reduce_only": False,
             "client_order_id": "12345678-1234-1234-1234-123456789abc"
         }
     }

Note that data must be in same level as other headers.

###
5. Recursively Sort JSON Keys

    def sort_json_keys(value):
        if isinstance(value, dict):
            sorted_dict = {}
            for key in sorted(value.keys()):
                sorted_dict[key] = sort_json_keys(value[key])
            return sorted_dict
        elif isinstance(value, list):
            return [sort_json_keys(item) for item in value]
        else:
            return value

    sorted_message = sort_json_keys(data_to_sign)

In the case of our example, this creates:

    {
         "data": {
             "amount": "0.1",
             "client_order_id": "12345678-1234-1234-1234-123456789abc",
             "price": "100000",
             "reduce_only": false,
             "side": "bid",
             "symbol": "BTC",
             "tif": "GTC"
         },
         "expiry_window": 5000,
         "timestamp": 1748970123456,
         "type": "create_order"
     }

Note that the recursive sorting alphabetically sorts *all* levels

###
6. Create Compact JSON

Compact JSON string with no whitespace and standardized seperators

    import json

    compact_json = json.dumps(sorted_message, separators=(",", ":"))

In the case of our example, this creates:

    {"data":{"amount":"0.1","client_order_id":"12345678-1234-1234-1234-123456789abc","price":"100000","reduce_only":false,"side":"bid","symbol":"BTC","tif":"GTC"},"expiry_window":5000,"timestamp":1748970123456,"type":"create_order"}

This ensures that all logically identical messages will always produce *identical* signatures

###
7. Convert to Bytes and Generate Signature

Messages are converted to UTF-8 bytes for signing. The signature generated is then converted to Base58 string for transmission.

    # Convert to UTF-8 bytes
    message_bytes = compact_json.encode("utf-8")

    # Sign message bytes using your private key
    signature = keypair.sign_message(message_bytes)

    # Convert signature to Base58 string
    signature_b58 = base58.b58encode(bytes(signature)).decode("ascii")

    # Expect an output similar to:
    # "5j1Vy9UqYUF2jKD9r2Lv5AoMWHJuW5a1mqVzEhC9SJL5GqbPkGEQKpW3UZmKXr4UWrHMJ5xHQFMJkZWE8J5VyA"

###
8. Build Final Request

Build the header with generated authentication info and combine with operation data (NOT the "data" wrapper!)

    request_header = {
        "account": public_key,
        "agent_wallet": None,
        "signature": signature_b58,
        "timestamp": signature_header["timestamp"],
        "expiry_window": signature_header["expiry_window"],
    }

    final_request = {
        **request_header,
        **operation_data,  # Use the ORIGINAL create order fields
    }

In the case of our example, the final request looks like:

     {
         "account": "6ETnufiec2CxVWTS4u5Wiq33Zh5Y3Qm6Pkdpi375fuxP",
         "agent_wallet": null,
         "signature": "5j1Vy9UqYUF2jKD9r2Lv5AoMWHJuW5a1mqVzEhC9SJL5GqbPkGEQKpW3UZmKXr4UWrHMJ",
         "timestamp": 1748970123456,
         "expiry_window": 5000,
         "symbol": "BTC",
         "price": "100000",
         "amount": "0.1",
         "side": "bid",
         "tif": "GTC",
         "reduce_only": false,
         "client_order_id": "12345678-1234-1234-1234-123456789abc"
     }

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Last updated 4 days ago