A: Submit application
B: Save request record
C: Attempt queue event
D: Return request ID
E: Application intends payment? (decision)
F: Retain acknowledgement
G: Submit ID and provider token
H: Attempt token save and refresh
I: Create provider customer
J: Calculate amount and create charge
K: Attempt result save
L: Return payment acknowledgement
A → B
B → C
C → D
D → E
E → F: No
E → G: Yes
G → H
H → I
I → J
J → K
K → L