SignAndSendTransaction

Once connected to Backpack, an application can ask the user for permission to send transactions on their behalf.

In order to send a transaction, an application must:

1. Create an unsigned transaction.

2. Have the transaction be signed and submitted to the network by the user's Backpack wallet.

3. Optionally await network confirmation using a Solana JSON RPC connection.

For more information about the nature of Solana transactions, please review the , as well as the .

Base URL

https://backpack.app/ul/v1/signAndSendTransaction

Query String Parameters

dapp_encryption_public_key (required): The original encryption public key used from the app for an existing session.
nonce (required): A nonce used for encrypting the request, encoded in base58.
redirect_link (required): The URI where Backpack should redirect the user upon completion. Please review for more details. URL-encoded.
payload (required): An encrypted JSON string with the following fields:

{
  "transaction": "...", // serialized transaction, base58-encoded
  "sendOptions": "..." // an optional Solana web3.js sendOptions object
  "session": "...", // token received from the connect method
}

Returns

Approve

nonce: A nonce used for encrypting the response, encoded in base58.

// content of decrypted `data`-parameter
{  
    "signature": "..." // transaction-signature
}

Reject

{          
    "errorCode": "...",          
    "errorMessage": "..."          
}

PreviousDisconnect NextSignAllTransactions

Query String Parameters

dapp_encryption_public_key (required): The original encryption public key used from the app for an existing session.

nonce (required): A nonce used for encrypting the request, encoded in base58.

redirect_link (required): The URI where Backpack should redirect the user upon completion. Please review for more details. URL-encoded.

payload (required): An encrypted JSON string with the following fields:

{
  "transaction": "...", // serialized transaction, base58-encoded
  "sendOptions": "..." // an optional Solana web3.js sendOptions object
  "session": "...", // token received from the connect method
}

transaction (required): The Backpack will sign and submit is serialized and encoded in base58.

sendOptions (optional): An optional object that specifies options for how Backpack should submit the transaction. This object is .

session (required): The session token received from the method. Please see for more details.

Returns

Approve

nonce: A nonce used for encrypting the response, encoded in base58.

data: An encrypted JSON string. Refer to to learn how apps can decrypt data using a shared secret. Encrypted bytes are encoded in base58.

// content of decrypted `data`-parameter
{  
    "signature": "..." // transaction-signature
}

signature: The first signature in the transaction can be used as its .

Reject

An errorCode and errorMessage as query parameters. Please refer to for a full list of possible error codes.

{          
    "errorCode": "...",          
    "errorMessage": "..."          
}