Add eCommerce integrations slides

ecommerce-integrations.md

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+---
+theme: light
+marp: true
+---
+
+![bg left:40% 40%](./media/btcpay-logo.svg)
+
+# BTCPay Server eCommerce integrations
+
+
+
+@ndeet, estimated block height #752730
+
+---
+
+# History has been made
+
+![bg right:60% 60%](./ecommerce-integrations/btcpay-birth-emperor.png)
+
+---
+
+# BitPay compatible API
+
+## Features
+* make BitPay obsolete
+* drop in replacement for merchants
+* checkout/payments
+* IPN callback notifications (insecure payload)
+
+---
+
+# Greenfield API
+
+![bg right](./ecommerce-integrations/mind-blown.gif)
+
+---
+
+# The future
+## Greenfield API
+
+### Features
+* modern REST API
+* easy API key setup
+* well documented using openAPI (Swagger)
+* webhooks/event with signed payload
+* managing wallets, pull payments/payouts (for refunds)
+* more detailed information
+* payment requests
+* and much more: Node/Apps/User/Store management, ...
+
+
+---
+
+# eCommerce integrations
+
+- Shopify *
+- WooCommerce *
+- Magento 2 *
+- PrestaShop *
+- Zapier *
+- VirtueMart *
+- OpenCart (soon) *
+- Drupal Commerce
+- Shopware
+
+\* using Greenfield API
+
+---
+
+![bg contain](./ecommerce-integrations/shopify_checkout_1.png)
+
+---
+
+![bg contain](./ecommerce-integrations/shopify_checkout_2.png)
+
+---
+
+# Common use cases
+
+* Basic checkout flow
+* Receiving notifications (IPN) / webhook events
+
+---
+
+# Other interesting use cases
+
+* separate payment methods
+  - payment method based discounts, vouchers, ...
+* no-redirect payment
+* refunds, pull payments
+* subscriptions via payment requests
+* automations (Zapier)
+
+---
+
+# WooCommerce
+
+## Separated payment gateways (payment methods)
+
+- discount on payment gateways
+- promotion tokens as vouchers
+
+See: [https://docs.btcpayserver.org/FAQ/Integrations/#woocommerce-faq](https://docs.btcpayserver.org/FAQ/Integrations/#woocommerce-faq)
+
+---
+
+## WooCommerce: discounts on payment gateways
+
+![](./ecommerce-integrations/payment_method_discount.png)
+
+---
+
+## WooCommerce: promotion tokens as vouchers
+
+e.g. Blockstream Jade, token from presale used to claim product
+
+![height:70%](./ecommerce-integrations/woocommerce_at_limit-payment-methods-rules.png)
+
+---
+
+# Custom integrations with Greenfield API
+
+
+## Libraries
+- C#
+- PHP (btcpayserver-greenfield-php on packagist.org)
+- JavaScript/NodeJS (help wanted)
+
+---
+
+## Custom integrations cURL / HTTP clients
+
+
+```bash
+curl -s \
+     -H "Content-Type: application/json" \
+     -H "Authorization: token $apikey" \
+     -X GET \
+     "$BTCPAY_INSTANCE/api/v1/stores/$store_id"
+```
+
+- [Greenfield API docs](https://docs.btcpayserver.org/API/Greenfield/v1)
+- [cURL examples](https://docs.btcpayserver.org/Development/GreenFieldExample/)
+
+---
+
+# What's next?
+
+---
+
+![bg contain](./media/supporters-light.png)