sats pay server documentation

lnbits/extensions/satspay/README.md

@@ -1,4 +1,27 @@
 # SatsPay Server
 
-Create onchain and LN charges. Includes webhooks!
+## Create onchain and LN charges. Includes webhooks!
 
+Easilly create invoices that support Lightning Network and on-chain BTC payment.
+
+1. Create a "NEW CHARGE"\
+   ![new charge](https://i.imgur.com/fUl6p74.png)
+2. Fill out the invoice fields
+   - set a descprition for the payment
+   - the amount in sats
+   - the time, in minutes, the invoice is valid for, after this period the invoice can't be payed
+   - set a webhook that will get the transaction details after a successful payment
+   - set to where the user should redirect after payment
+   - set the text for the button that will show after payment (not setting this, will display "NONE" in the button)
+   - select if you want onchain payment, LN payment or both
+   - depending on what you select you'll have to choose the respective wallets where to receive your payment\
+     ![charge form](https://i.imgur.com/F10yRiW.png)
+3. The charge will appear on the _Charges_ section\
+   ![charges](https://i.imgur.com/zqHpVxc.png)
+4. Your costumer/payee will get the payment page
+   - they can choose to pay on LN\
+     ![offchain payment](https://i.imgur.com/4191SMV.png)
+   - or pay on chain\
+     ![onchain payment](https://i.imgur.com/wzLRR5N.png)
+5. You can check the state of your charges in LNBits\
+   ![invoice state](https://i.imgur.com/JnBd22p.png)