Basic structure

TODO.md

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+# TODO
+* Support of various cryptocurrencies
+    * Bitcoin
+    * Bitcoin Cash
+    * Monero
+    * Dogecoin
+    * Ethereum
+    * Litecoin
+* Admin backend
+    * See total earning
+    * See latest transcations
+    * See all invoices
+* Send coins to another wallet periodically
+    * Optionaly, send them through a coin mixer
+* Convert any fiat price to any supported crypto
+* Generate invoice as PDF
+* Payment site
+    * Show product data
+        * Title
+        * Price
+        * Image
+        * Quantity
+    * Website should either set the wanted cryptocurrency
+      in advance or the user is free to choose
+    * Success and cancel URL
+    * Sessions
+    * Payment should be still available after completion