Render sequence diagram from included mermaid source

Author: DanGould

bip-0077.md

@@ -112,32 +112,8 @@ temporary disconnections and resume communication by polling.
 
 ### Async Payjoin Directory Mediated Sequence Diagram
 
-```text
-  +----------+            +------------+            +----------+            +----------+
-  | Receiver |            | Directory  |            | Sender   |            | Network  |
-  +----+-----+            +-----+------+            +----+-----+            +----+-----+
-       |                        |                        |                       |
-       |  Payjoin URI (BIP21), out-of-band               |                       |
-       +------------------------------------------------>|                       |
-       |                        |                        |                       |
-       |  Poll GET: original PSBT (repeat until available)                       |
-       +- - - - - - - - - - - ->+                        |                       |
-       |                        #  POST: original PSBT   |                       |
-       |                        #<-----------------------+                       |
-       |  200 OK: original PSBT #                        |                       |
-       |<-----------------------+                        |                       |
-       |                        |                        |                       |
-       |                        |  Poll GET: proposal PSBT (repeat until available)
-       |                        +<- - - - - - - - - - - -+                       |
-       |  POST: proposal PSBT   #                        |                       |
-       +----------------------->#                        |                       |
-       |                        #  200 OK: proposal PSBT |                       |
-       |                        +----------------------->|                       |
-       |                        |                        |                       |
-       |                        |                        |  Broadcast payjoin    |
-       |                        |                        +---------------------->|
-       |                        |                        |                       |
-```
+<!-- Source: bip-0077/sequence-diagram.mermaid -->
+![Async Payjoin Sequence Diagram](bip-0077/sequence-diagram.svg)
 
 ## Specification
 

bip-0077/sequence-diagram.mermaid

@@ -0,0 +1,22 @@
+sequenceDiagram
+    title Async Payjoin Sequence Diagram
+    participant R as Receiver
+    participant D as Directory
+    participant S as Sender
+    participant N as Network
+
+    R-)S:  Payjoin URI (BIP 21) out of band
+
+    R-->>D: Poll GET Requests<br/>for Original PSBT
+    activate D
+    S->>D: POST Request<br/>Original PSBT
+    D->>R: GET Response<br/>Original PSBT
+    deactivate D
+
+    S-->>D: Poll GET Requests<br/>for Proposal PSBT
+    activate D
+    R->>D: POST Request<br/>Proposal PSBT
+    D->>S: GET Response<br/>Proposal PSBT
+    deactivate D
+
+    S->>N: Broadcast Payjoin