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participant "Patient Registry" as PR

control "Match-Connect" as MC

control "Search & Match\nService" as SM

participant "Donor Registry" as DR

skinparam SequenceMessageAlign center

skinparam dpi 92

== Sending a user generated message ==
PR -[#dodgerblue]> DR : Send 'Message A'

group details

DR -[#dodgerblue]> MC : Call /availableMessages to check for not-picked up messages
activate MC #FFBBBB
MC -> DR : 200 OK - Array of messages not yet delivered (**emtpy**)
MC -> DR : 400 Bad Request
deactivate MC

PR -[#dodgerblue]> MC : Call respective Request-API to send 'Message A'
activate MC #FFBBBB
MC -> PR : 200 OK
MC -> PR : 400 Bad Request
deactivate MC
 
DR -[#dodgerblue]> MC : Call /availableMessages to check for not-picked up messages
activate MC #FFBBBB
MC -> DR : 200 OK - Array of messages not yet delivered (**'Message A'**)
MC -> DR : 400 Bad Request
deactivate MC
 
DR -[#dodgerblue]> MC : Call respective Response-API to picked up 'Message A'
activate MC #FFBBBB
MC -> DR : 200 OK
MC -> DR : 400 Bad Request
deactivate MC 
end
== Providing the generic response ==
DR -[#dodgerblue]> PR : Message response (ack, reject, warning to 'Message A') \nshould always include messageId of referring message

group details
PR -[#dodgerblue]> MC : Call /availableMessages to check for not-picked up messages
activate MC #FFBBBB
MC -> PR : 200 OK - Array of messages not yet delivered (**emtpy**)
MC -> PR : 400 Bad Request
deactivate MC

DR -[#dodgerblue]> MC : Call /messageResponse API to send the generic response to 'Message A'
activate MC #FFBBBB
MC -> DR : 200 OK
MC -> DR : 400 Bad Request
deactivate MC
 
PR -[#dodgerblue]> MC : Call /availableMessages to check for not-picked up messages
activate MC #FFBBBB
MC -> PR : 200 OK - Array of messages not yet delivered (**generic response to 'Message A'**)
MC -> PR : 400 Bad Request
deactivate MC
 
PR -[#dodgerblue]> MC : Call /messageResponseRetrieve API to pick up the generic response to 'Message A'
activate MC #FFBBBB
MC -> PR : 200 OK
MC -> PR : 400 Bad Request
deactivate MC
 
end