Hack A Lapp: Introduction to Bitcoins Lightning Network App Development/C-Lightning with python/Ask your customer to pay with bitcoins lightning network by creating a lightning invoice

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Ask your customer to pay with bitcoins lightning network by creating a lightning invoice

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Learning goals

  1. install pylightning module
  2. invoke an Remote Procedure Call to your c-lightning node in a python code base
  3. create an invoice for your customer
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Video

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Script

exercise: invoice = rpc_interface.invoice() was executed. Find out which meta data besides the bolt11 string is provided. What is the meaning of this meta data?

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Quiz

1

What is the correct syntax to create an invoice in python?

rpc_interface.invoice()
rpc_interface.create_invoice()
rpc_interface.invoice(2000, "label", "description")
rpc_interface.create_invoice(2000, "label", "description")

2

looking at the pylightning api client we find the declaration of the invoice function: def invoice(self, msatoshi, label, description, expiry=None, fallbacks=None, preimage=None ): What does that tell us?

The invoice needs to have 6 arguments
The invoice can have up to 6 arguments
The invoice must have at least 3 arguments

3

If you don't provide the expire argument, how long will the invoice be valid?

Forever, since it does not expire
144 Block times
1 Hour

4

you have successfully invoked the .invoice() RPC-function and stored the object to the variable called invoice. How do you print the bolt11 string?

print(invoice["bolt11"])
print(invoice)
invoice.get_bolt11()
< code> invoice.bolt11()

5

initiating the rpc interface with rpc_interface = LightningRpc() we need to pass a string as an argument. Which value should the string be given?

the local path the the lightning-rpc file
publickey of your lightning node followed by its IP address and port
some unique identifier for your pythong programm to be able to access the interface



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Discussion