Use HTTP Callout PUT Method (use POST to get ID and then use for PUT operation) in flow #inSalesforce

Use HTTP Callout PUT Method (use POST to get ID and then use for PUT operation) in flow #inSalesforce

Create a Named Credential, External Credential and Permission Set

External Credential: Http Callout External Credential (same name), Custom auth

Create: Principal

Parameter Name: Http Principal, sequence number 1 and identity Type - Named Principal

Create Permission Set: Http Callout Permission Set

Add External Cred. Principal Access to the Permission Set (Select to Enabled External Cred. Principals) | Save

Add the permission set to User

Named Credential:

Http Named Credential (same name)

URL: https://api.restful-api.dev

External Cred: Select the one you created

No header required

POST Method - To get Id in the Response to be used in Put

Create flow: screen

Action: Create HTTP Callout

HttpCalloutService

Select the Named Credential you created

Configure Invocable Action:

Http Post Action (Label)

Method: POST

URL Path: /objects

Sample Request and Response: Add from the website as in visual | Review | Done

Details on ACtion:

Http Post Action Element

Value: New resource | PostActionVariable | Done

Assignment:

Assign values to Post variable

PostActionVariable.Data.Name equals Apple MaxBook Pro 16

PostActionVariable.Data.Model equals Intel Core i9

PostActionVariable.Data.HardDisk equals 1 TB

PostActionVariable.Data.Price equals 1849.99

PostActionVariable.Data.Year equals 2019

Done

Save the flow and debug

For PUT: (to update data using the id fetched from post)

Append another Action:

Add Action Element:

Name: HttpPutExternalService

Use the same Named Credential

Configure Invocable Action:

Http Put Action, PUT Method

URL Path:

/object/{postId} [postId- contains the id of the response]

the datatype of Id String

Sample Request and Response: Add from the website as in 

visual | Review | Done

Details on ACtion:

Http Put Action Element

Value: Select ouputfrompostaction.Id

Request body:

value: Create an apex-defined variable | ActionPutBodyVariable

Done

Assignment:

Assign values to ActionPutBodyVariable

ActionPutBodyVariable.Data.Name equals Apple MacBook Pro 17

ActionPutBodyVariable.Data.Model equals Intel Core i9

ActionPutBodyVariable.Data.HardDisk equals 2 TB

ActionPutBodyVariable.Data.Price equals 2049.99

ActionPutBodyVariable.Data.Year equals 2020

Done

Save and debug