Blockchain payment processing

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You provide an extended public key xPub blockchain payment gateway we generate a unique, unused corresponding address for your customers to send payment to. We notify you of payments to that address instantly using a callback URL of your choosing. One of the difficulties involved with receiving bitcoin payments is the need to generate a unique address for each new user or invoice. These addresses need to monitored and stored securely. The blockchain receive payments API takes care of the generation and monitoring of addresses.

We will notify your server using a simple callback whenever a payment is received. The easiest way to start receiving payments is to open a Blockchain Wallet at https: You should create a new account inside your wallet exclusively for transactions facilitated by this API.

This method creates a unique address which should be presented to the customer. For any payments sent to this address, you will be sent an HTTP notification. This is done so you do not show the same address to two different customers. However, all funds will still show within the same account. As defined in BIP 44, wallet software will not scan blockchain payment gateway 20 unused addresses. Given enough requests from this API that don't have a matching payment, you could generate addresses past this horizon, which would make spending funds paid to those addresses quite difficult.

For this reason, this API will return an error and refuse to generate new addresses if it detects it would create a gap of blockchain payment gateway 20 unused addresses. If you encounter blockchain payment gateway error, you will either need to switch to a new xPub within the same wallet is fineor receive a payment to one of the previous 20 created addresses.

Please note, this will not increase the number of addresses that will be monitored by our servers. Using this feature will require you understand the gap limitation and how to handle it for advanced users only:. You will be sent an HTTP notification immediately when a transaction is made, and subsequently when it reaches the number of confirmations specified in the request.

You are required to specify the request's notification behaviour. Setting the behaviour to 'DELETE' will delete the request after the first blockchain payment gateway notification is sent to your callback address. Blockchain payment gateway the behaviour to 'KEEP' will send additional notifications every time a transaction with the specified confirmations and operation type is sent to or from the address in the request.

Operation type is an optional parameter indicating whether the address will be monitored for received or spent transactions, or both. By default both operation types are monitored. You may also optionally specify the number of confirmations a transaction reaches before being sent a notification.

Note that you will receive a notification at 0 confirmations i. This method allows you to request callbacks when a new blockchain payment gateway of a specified height and confirmation number is added to the blockchain.

Height is an optional parameter indicating at which height you blockchain payment gateway like to receive a block notification - if unspecified, this will be the height of the next block to arrive.

Confs is another optional parameter indicating how many confirmations a block should have when a notification is sent. When a payment is received by a generated address, or by an address monitored by a balance update request, blockchain payment gateway.

For balance update callbacks blockchain payment gateway additional notification will be sent once the transaction reaches the specified number of confirmations. A block notification is sent every time a new block is added to the blockchain, and matches the height and number of confirmations set in the notification request. If the server responds with anything else, or nothing, the callback will be resent again for every new block approximately every 10 minutes up to times blockchain payment gateway week.

Check the index gap between last address paid to and the blockchain payment gateway address generated using the using the checkgap endpoint. Use the xpub you want to check and your API key like so:. Use the exact callback in question and your API key like so:. A custom secret parameter should be included in the callback URL.

The secret will be passed back to the callback script when the callback is fired, and should be checked by your code for validity. This prevents someone from blockchain payment gateway to call your servers and falsely mark an invoice as 'paid'.

The Blockchain payment gateway Apps below include examples of how to do this. If you would like convert payments received in Bitcoin to fiat currency quickly use a bitcoin address from an exchange wallet. A double spend occurs when a malicious user spends the same BTC twice. A payment that initial appears successful could be reversed at a later date. This is counteracted by waiting for the transaction to be included in the blockchain and reaching a number of confirmations.

It is recommended you acknowledge the transaction at zero confirmations but only trust the transaction blockchain payment gateway one confirmation. See the PHP demo callback. There is no limit to the number of receiving address which can be generated as long as the 20 address gap limitation is metthe service is designed to monitor millions of addresses.

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Mycelium uses the distributed online ledger known as the Blockchain to process transactions. For merchants and operating institutions, Mycelium provides Blockchain-compatible software consoles for managing invoice payments, purchases, account replenishments and other operations. For consumers, Mycelium provides a mobile wallet and Blockchain-compatible card for sending and receiving payments. The mobile wallet functions similarly to many advanced payment and banking applications.

Mycelium does not use any cryptocurrencies for payments. It uses digital tokens that can be passed over the Blockchain from one node to another in a secure, fast, and inexpensive manner. Each type of unit is backed up by the legal promise of an issuing institution just like any fiat currency or legacy-protected asset would be.

Mycelium's cutting-edge technology delivers advanced functionality the likes of which have never been seen within financial technology. Any issuer can create a community of card holders, set pricing, and transfer any type of asset over the network. The acquirer function has become simplified and seamless. Inexpensive, fully wireless and contactless POS.

Merchants can use regular internet service providers and ordinary routers to connect. Security or authorization codes are entered directly to the card by hand. Nothing ever touches the card. Contact-less long range functionality allows a merchant to perform a transaction anywhere within a nearby vicinity. Mycelium serves a diverse community of financial institutions and merchants by offering competitive business solutions for the technological environment of a new generation.

Mycelium does not use any cryptocurrency. Its value units are backed up by the legal promise of an issuing institution. Units can be exchanged over the Blockchain in a secure, fast, and inexpensive manner.

As a longtime and prominent member of the Blockchain business community Mycelium is the natural choice for disruptive and innovative payment solutions within this burgeoning commercial space. Unlike the competition, Mycelium is self-sufficient. Unlike traditional systems e. Visa, AmEx, MasterCard Mycelium utilizes only a few hardware elements to achieve unparalleled efficiency. Mycelium is a comprehensive alternative; it offers a complete solution while incumbent systems represent only part s of a complicated framework.

There is no other hardware required. ISO compatible card size; compatible with the legacy infrastructure; established user perception. Cards are mesh-network ready i.

The colored coins over Bitcoin protocol supports payments in fiat currencies and transfers for other values. Mycelium card—a compact, stand-alone device acting as electronic wallet—can function as a key, pass, ticket, ID.

ECDSA bits signature calculation ms, 2. Card link range m with direct line of sight and up to 50 m in urban propagation conditions. Low Rx channel sampling energy. An issuer performs many functions such as gathering KYC data and managing backend accounts. This sort of functionality allows Mycelium to develop a competitive advantage over traditional issuers. Issuer provides consumers with cards and mobile wallets; deposits money in relation to debt or deposits; maintains account data.

Amazingly, an issuer can serve as an acquirer by simply buying back its digital tokens. Another option is to list those tokens on third-party cryptocurrency exchanges. An issuing institution can expand its reach by buying back its digital tokens from other banks at a reasonable discount.

Cards and wallets can pay to one another directly as well as to merchant consoles. Additionally, merchants may be enabled to top-up accounts directly. Consumers can transact i. Similarly, merchants are free to trade tokens anywhere they prefer.

No party, including merchant's bank, needs to control or certify its hubs since they do not store any user-data. Their entire function is to serve as wireless traffic gateways. Deployment includes the following four stages. Associated costs with these steps and total deployment time may vary but should stay below the following benchmarks:. This includes basic educational sessions held in several branches. Local certification of new services and physical cards are not included.

The KYC and accounts backend software processes remain the same. The main addition to usual procedures is the handling of money emission. Operationally, it is quite straightforward. However, each issuer needs to create safety procedures to protect issuer's status and the already issued money from devaluation through a fraudulent emission. Mycelium makes many network-related procedures obsolete. Educational sessions will cover the topic of how to fill the gaps of ordinary workflow procedures.

This includes hardware, printed instructions, and one voice-call session with our support stuff. This estimation is based on a standard floor-space size of no more than a few hundred square meters. Payment from a phone is possible either through the scanning of QR codes or by entering an invoice number into the card.

Changes to the payment procedure will incur additional costs associated with an increased number of support inquires. If implemented slowly and steadily, the deployment period may not require additional support personnel.

The distribution costs for mobile wallets should not exceed a few dollars per person assuming the targeted users are already part of an existing client base.

Most banks have internal statistics regarding mobile application adoption. Mycelium capabilities could even be included as a part of regular software upgrades. Please note that cards, being a more conventional means of payment, promise to deliver better adoption rates when compared to mobile applications.

Each card can really create additional value for the issuer. Any costs or fees required for card implementation are offset by its advanced functionality and value-added services for customers.

Eventually, higher volumes will drive the price down as well. We do not aim to control the ecosystem but rather let it develop in a variety of ways. Each issuer is unique and so each profit sharing scheme will be different. Below is the standard break-down:. Checking Balance To check a current balance, a card holder needs to push and hold Button "1". The balance is also displayed after each completed payment. Making a Payment The default mode of the card is "Pay".

To pay, the card holder needs to enter a two-digit invoice number and tap OK. The payee can use any channel of communication to inform the paying party the card holder what the invoice number is: This communication does not necessarily have to be secure. Invoices can be created either with a card or through a Mycelium mobile or web application. When the card finds the needed invoice, it displays the item name and the amount to be paid. At this point a security measure is applied: The card performs a "handshake" via ECDH key exchange and thus establishes an encrypted session.

The common key for this symmetric encryption is stored aboard the card and can be used again if the same cards need to perform a P2P transaction at a later time. Receiving Money To receive payment the cardholder needs to push and hold Button "3" after which the card shows the invoice number that it is currently transmitting. That invoice number needs to be communicated by the cardholder to the paying party. The reason is for improved security since frequently used buttons might become visible due to abrasion.

Card holders can change the authorization code anytime from the card, itself by holding Button "8" to enter Code Changing Mode. A card can also be completely reset with a PUK code.

It is suggested that users store one or two blank cards to be able to restore a lost card at any time without requiring assistance from financial institutions. Associated costs with these steps and total deployment time may vary but should stay below the following benchmarks: Below is the standard break-down: