CashP - PHP library for Bitcoin Cash (BCH) and SLP token payments

This is a PHP library to enable BitCoin Cash (BCH) and SLP token payments. You can easily use this with WordPress, Laravel and other PHP frameworks.

Installation

With composer (recommended):

composer require "ekliptor/cashp"

Manual installation:

1. Download the source code and include cashp.php from the root directory of this library.
2. Download the source of this PHP QR-code package and extract it to src/phpqrcode

Requirements

PHP >= 7.1

Features

• on-chain payments without going through a 3rd party
• configurable open-source API backends such as: rest.bitcoin.com or BCHD
• 1-time address generation for payments using xPub (so your wallet's private key is not stored on the server)
• generate QR codes with BCH and SLP payment URIs

Docs

Take a look at code examples.

CashP class

__construct(CashpOptions $options = null)

Create the main API class.

• CashpOptions $options - (optional) API options (see below)

getRate(): ExchangeRate

Return the exchange rate API.

getBlockchain(): AbstractBlockchainApi

Return the Blockchain API to generate addresses, check balances, transactions,...

generateQrCodeForAddress(string $fileLocal, string $address, float $amountBCH, float $amountToken = 0.0, string $tokenID = ""): bool

Generate a QR code for a payment.

• string $fileLocal - A path on your local filesystem to store the QR code file. This should be accessible from the web if you want to display the QR code to users. If the given file already exists it will NOT be overwritten (QR codes are meant to be generated & cached in your web temp directory).
• string $address - The (1-time) BCH (or SLP) address created for this payment.
• float $amountBCH - The amount in BCH. Can be 0 if the user pays the full amount in SLP tokens.
• float $amountToken - (optional) The amount of the optional token to be received.
• string $tokenID - (optional) The hex ID of the SLP token. Required if $amountToken > 0.

returns bool - true on success, false otherwise

---

createPaymentURI(string $address, float $amountBCH, float $amountToken = 0.0, string $tokenID = ""): string

Return a payment URI (starting with "bitcoincash:" or "simpleledger:" if $amountToken > 0) for the given $address.

• string $address - The receiving BCH (or SLP) address.
• float $amountBCH - The amount in BCH to receive.
• float $amountToken - (optional) The amount of SLP tokens to receive.
• string $tokenID - (optional) The hex ID of the SLP token. Required if $amountToken > 0.

returns string

---

getBadgerButton(array $btnConf, string $address, float $amountBCH, float $amountToken = 0.0, string $tokenID = ""): string

Get the HTML code of a BadgerButton. See https://badger.bitcoin.com/

• array $btnConf - associative array with buttom config
  • text (string) The text of the button
  • callback (string, optional) The name of a callback function present on the global window to be called after payment. Parameters: string chainTxID
  • cssClass (string, optional) Additional CSS classes for the button.
  • forceIndludeJs (bool, optional) default false - Include the JavaScript library again. Only use this if you are generating HTML for multiple pages.
• string $address - The receiving BCH (or SLP) address.
• float $amountBCH - The amount in BCH to receive.
• float $amountToken - (optional) The amount of SLP tokens to receive.
• string $tokenID - (optional) The hex ID of the SLP token. Required if $amountToken > 0.

returns string - The button HTML.

---

isValidBchAddress(string $bchAddress): bool

Check if a BCH address is valid.

• string $bchAddress - The address in CashAddress format starting with 'bitcoincash:'

returns bool - True if the address is valid, false otherwise.

---

isValidSlpAddress(string $slpAddress): bool

Check if a SLP address is valid.

• string $slpAddress - The address starting with 'simpleledger:'

returns bool - True if the address is valid, false otherwise.

---

getReturnAddress(Transaction $tx): string

Gets the return BCH address (belonging to the sender senders address) defined as the last address in transaction outputs.

• Transaction $tx - The transaction from getTransaction() call.

returns string - the address

---

getReturnSlpAddress(Transaction $tx): string

Gets the return SLP address (belonging to the sender senders address) defined as the last address in transaction outputs.

• Transaction $tx - The transaction from getTransaction() call.

returns string - the address

---

CashpOptions class

A set of advanced config properties.

• $httpAgent = null - The HTTP implementation used to make HTTP requests. Values: BasicHttpAgent|CurlHttpAgent|WordpressHttpAgent Defaults to BasicHttpAgent, but you should use a better one according to your PHP setup.
• $exchangeRateExpirationMin = 60 - How long the crawled exchange rate shall stay in cache. Currently rates are not saved beyond script execution.
• $httpTimeoutSec = 10 - The timeout for HTTP requests to the REST API backend.
• $blockchainApiImplementation = "BitcoinComRestApi" - The REST API backend implementation to use. Allowed values: BitcoinComRestApi|BchdProtoGatewayApi|SlpDbApi

ExchangeRate class

An API to get BCH exchanges rates to fiat currencies.

getRate(string $currency = "USD"): float

Get the current exchange rate for BCH.

• string $currency - A fiat currency such as USD|EUR|JPY

returns float

---

BlockchainApi class

The Blockchain API to generate addresses, check balances, transactions,...

static setLogger(callable $loggerFn): void

Set a logger function for errors and debug output. Use this to write to a logfile or database. If no function is provided everything will be printed using 'echo'.

• callable $loggerFn(string $subject, mixed $error, mixed $data = null) - parameters of the PHP callable

setHttpAgent(AbstractHttpAgent $agent): void

Set a a HTTP implementation for requests (cURL, Wordpress HTTP API,...)

• AbstractHttpAgent $agent -

getConfirmationCount(string $transactionID): int

Return the number of confirmation for the given blockchain transaction ID.

• string $transactionID -

returns int - The number of confirmations or -1 if the $transactionID doesn't exist.

---

createNewAddress(string $xPub, int $addressCount, string $hdPathFormat = '0/%d'): ?BchAddress

Creates a new address from the xPub.

• string $xPub - The extended public key. Called 'Master Public Key' in Electron Cash.
• int $addressCount - The number of the next address to generate a unique address. Usually this should be an incrementing integer.
• string $hdPathFormat - (optional) The HD path to be used for creating address children.

returns BchAddress - the address or null on failure

---

getTokenInfo(string $tokenID): ?SlpToken

Get general (network-wide) info about a SLP token.

• string $tokenID -

returns SlpToken - The token or null on failure

---

getAddressBalance(string $address): float

Return the BCH balance of the given address (including unconfirmed transactions).

• string $address - The BCH address in CashAddress format.

returns float - The balance or -1 if the address doesn't exist.

---

getAddressTokenBalance(string $address, string $tokenID): float

Return the token balance of the given SLP address (including unconfirmed transactions).

• string $address -
• string $tokenID -

returns float - The balance or -1 if the address doesn't exist.

---

getAddressDetails(string $address): ?BchAddress

Return the BCH Address with all its properties such as balance, TXIDs,...

• string $address - The BCH address in CashAddress format.

returns BchAddress - the address or null on failure

---

getSlpAddressDetails(string $address, string $tokenID): ?SlpTokenAddress

Return the SLP token details of a given address include balance, TXIDs,...

• string $address -
• string $tokenID -

returns SlpTokenAddress - The token or null on failure

---

getTransaction(string $transactionID): ?Transaction

Returns a transaction with all inputs and outputs including SLP data.

• string $transactionID -

returns Transaction - The transaction or null on failure

---

Testing

To run unit tests type the following command in the project root directory (requires PHPUnit, installed automatically with Composer):

./vendor/bin/phpunit --bootstrap vendor/autoload.php tests

ToDo

• add SLP address verification
• implement more functions of the REST API
• implement address creation using xPub with SLPDB (after it's supported)

Contact

Twitter

WordPress plugin