We are working on a prototype for payment processing using the Stellar Platform. To receive payments, for now creating an account is mandatory. To send payments (pay invoices) an account with us is not needed.

Online Shops

The process will be as easy as end-users are used to from existing payment-platforms. A checkout-button redirects them to our website where they can
- sign in to their WebWallet account to pay with their in-account balance
- pay by signing the transaction with their own private key
- initiate the payment from any other wallet/accountviewer (stellarterm, stellar laboratory etc) they trust
- scan the QR code to pay with a mobile wallet

Knowledgebase for setting up the payment button as a merchant using our API for custom solutions will be almost as easy as using one of the plugins for widely known shopping scripts (Magento, WooCommerce etc).

Mobile Apps

Similar to the process of Online Shops but with a separate app for merchants, aimed primarily at retail and food industry. The merchant can set up sub-accounts for employees (important when using less devices than employees) to track who accepted which payment and in case tipping is enabled to either pay out the tip to the right employee or if the employee is a registered user, automatically forward the tip to the right useraccount.

Other Cryptocurrencies

To facilitate payments in cryptocurrencies other than XLM, we will take over the role as the Anchor and issue assets for each external cryptocurrency we want to support. The user can send us their Coin/Token on the external blockchain and gets credited with the corresponding asset on the Stellar Platform. We will also support issued assets of other Anchors if they are trusted.

The merchant can set which assets he accepts as payment. In case the user doesn't have the asset the merchant accepts, he can buy the asset needed on the (integrated) SDEX either automatically or manually.

Tracking addresses

The user will be able to add public keys to track their assets and movements. This will be extended with every new supported asset for other blockchains as well as exchanges that support read-only API to enable the user to overview all in one account.

This is the short version, a lot more features are planned. More information and screenshots will be added as development progresses.
WebWallet is entirely private funded and doesn't plan to charge any fees. We hope that donations by the community and hopefully a grant will keep it this way.

24 days later

Dashboard

Very early version, showing the assets owned and most recent transactions. Final version will be more user friendly with less information on first sight. TransactionID, Source and full time stamp will then be shown on-click.
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Merchant API And Profile Setup

Every user can also set up a merchant profile in his account. We want to encourage merchants to provide a discount to customers that pay with crypto due to the fees saved by not having to pay VISA, Paypal etc.
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Merchant Profile Listing

User can create a new merchant profile for each website/business. Widget-code and API key for each is displayed when clicking on 'Get Widget'.
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Sending Assets

In the MVP, the only asset we support for now is the native XLM. Shown below is the usual method and its needed transaction information. To be added are off-chain transactions (using only the WebWallet userhandle), Social payments using the verified social handles and in case of anchored assets, the option to withdraw tothe native chain.
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Payment Process

After some input from @dzham we want to note that the option to sign with the private key as shown in the gif below will be removed from the checkout widget. QR code to scan by other wallets will be added.
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Right now, we are working on adding other assets that are already live on Stellar.

This is a working not a beautiful "design" ?

I really don't like seeing new apps still coming out that ask for a users secret key. At least provide a method to pay with a QR-code or Nano ledger instead. Might see https://galactictalk.org/d/12-formats-for-qr-codes-uris-nfcs/35. For simple payments the stargazer wallet QR-code format method should be good enough. The more apps that begin making use of the formats, the sooner we might consider them to be standards and others will follow.

Didn't anyone learn anything from the Blackwallet hack?

    sacarlson what you are criticizing here has been addressed right above the gif that shows the option:

    After some input from @dzham we want to note that the option to sign with the private key as shown in the gif below will be removed from the checkout widget. QR code to scan by other wallets will be added.

    I'm still not sure I understand why it is better to take away the secret from the user so they depend on a wallet to work but for now we accept the overall sentiment regarding the freedom of choice and remove this option.

      [unknown] will be added here as soon as possible but this is mainly an entry to the SBC not a promotional post. Testsite will be provided to the Stellar Team upon submission. There is no public live version as of now.

      Added Two Factor Authorization (2FA):

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      Working on adding other assets on Stellar Network as payment option and QR code generation using the by @sacarlson mentioned solution by @dzham . I hope that others start using the same so we can make it an accepted standard among Stellar applications.

      a year later