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...

<basecamp.createMessage>
	<subject>{$ctx:subject}</subject>
	<messageBoardId>{$ctx:messageBoardId}</messageBoardId>
	<status>{$ctx:status}</status>
	<projectId>{$ctx:projectId}</projectId>
	<content>{$ctx:content}</content>
	<categoryId>{$ctx:categoryId}</categoryId>
</basecamp.createMessage> 

Properties

• subject: The subject of the message.

• messageBoardId: The unique identifier of the message board. When click the message Board of the project, You can find the message Board Id in the URL (The URL is structured like :https://3.basecamp.com/<accountId>/buckets/<projectId>/message_boards/<messageBoardId>).

• status: set to active to publish immediately

• projectId: The unique identifier of the project.

• content[optional]: The content of the message.

• categoryId[optional]: The unique identifier of the type of the message.

...

<basecamp.getMessage>
	<projectId>{$ctx:projectId}</projectId>
    <messageId>{$ctx:messageId}</messageId>
</basecamp.getMessage> 

Properties

• projectId: The identifier of the project from which the message will be retrieved.

• messageId: The message identifier to retrieve the specified message.

...

{
	"apiUrl":"https://3.basecampapi.com",
    "accessToken":"BAhbByIBsHsidmVyc2lvbiI6MSwidXNlcl9pZHMiOlsyMTDg13LTA0VDA3OjM2OjMxWiJ9dToJVGltZQ2HmBzAqS77kQ==--1fb2c32e4d904b7960b77d5e81db7c6666dee01c2",
    "accountId":"2669154",
	"projectId":"6224144",
	"messageId":"27383420"
}

Related Basecamp documentation

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The updateMessage operation allows changing the subject, content and category_id of the message.

<basecamp.updateMessage>
    <projectId>{$ctx:projectId}</projectId>
    <messageId>{$ctx:messageId}</messageId>
    <subject>{$ctx:subject}</subject>
    <content>{$ctx:content}</content>
	<categoryId>{$ctx:categoryId}</categoryId>
</basecamp.updateMessage> 

Properties

• projectId: The identifier of the project from which the message will be retrieved.

• messageId: The message identifier to retrieve the specified message.

• subject: The subject of the message.

• content: The content of the message.

• categoryId: The unique identifier of the type of the message.

...

{
	"apiUrl":"https://3.basecampapi.com",
    "accessToken":"BAhbByIBsHsidmVyc2lvbiI6MSwidXNlcl9pZHMiOlsyMTDg13LTA0VDA3OjM2OjMxWiJ9dToJVGltZQ2HmBzAqS77kQ==--1fb2c32e4d904b7960b77d5e81db7c6666dee01c2",
    "accountId":"2669154",
	"projectId":"6224144",
	"messageId":"27383420",
	"subject": "Update subject",
	"content":"Update sample message abc",
	"categoryId": "5671895"
}

...