# Prerequisites
<a name="id-mapping-workflow-prerequisite"></a>

Before you create an ID mapping workflow for one AWS account using either the **Rule-based** or the **Provider services** ID mapping method, you must first do the following:
+ Complete the tasks in [Setting up AWS Entity Resolution](https://docs.aws.amazon.com/entityresolution/latest/userguide/setting-up.html).
+ Complete the tasks in [Prepare input data tables](prepare-data-tables.md), depending on the type of input data you are using.
+ [Create a schema mapping](create-schema-mapping.md) or [Create a matching workflow](create-matching-workflow.md).
+ (**Provider services** ID mapping only) Before you create an ID mapping workflow with LiveRamp, you must choose an Amazon Simple Storage Service (Amazon S3) data staging bucket where you want to temporarily write the ID mapping workflow output. 

  If you are using the LiveRamp provider service to translate third-party data, add the following permissions policy, which allows you to access the data staging bucket.

------
#### [ JSON ]

****  

  ```
  {
      "Version":"2012-10-17",		 	 	 
      "Statement": [
          {
              "Effect": "Allow",
              "Principal": {
                  "AWS": "arn:aws:iam::715724997226:root"
        
              },
              "Action": [
                  "s3:PutObject",
                  "s3:GetObject",
                  "s3:GetObjectVersion",
                  "s3:DeleteObject"
              ],
              "Resource": [
                  "arn:aws:s3:::<staging-bucket>",
                  "arn:aws:s3:::<staging-bucket>/*"
              ]
          },
          {
              "Effect": "Allow",
              "Principal": {
                  "AWS": "arn:aws:iam::715724997226:root"
              },
              "Action": [
                  "s3:ListBucket",
                  "s3:GetBucketLocation",
                  "s3:GetBucketPolicy",
                  "s3:ListBucketVersions",
                  "s3:GetBucketAcl"
              ],
              "Resource": [
                  "arn:aws:s3:::<staging-bucket>",
                  "arn:aws:s3:::<staging-bucket>/*"
              ]
          }
      ]
  }
  ```

------

  In the preceding permissions policy, replace each *<user input placeholder>* with your own information.    
[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/entityresolution/latest/userguide/id-mapping-workflow-prerequisite.html)