Lambda functions and attributes - Amazon Connect

Lambda functions and attributes

Retrieve data from a system your organization uses internally, such as an ordering system or other database with a Lambda function, and store the values as attributes that can then be referenced in a contact flow.

When the Lambda function returns a response from your internal system, the response is key-value pairs of data. You can reference the values returned in the External namespace, for example $.External.attributeName. To use the attributes later in a contact flow, you can copy the key-value pairs to user-defined attributes using a Set contact attributes block. You can then define logic to branch your contact based on attribute values by using a Check contact attributes block. Any contact attribute retrieved from a Lambda function is overwritten with the next invocation of a Lambda function. Make sure you store external attributes if you want to reference them later in a contact flow.

To store an external value from a Lambda function as a contact attribute

  1. In Amazon Connect, choose Routing, Contact flows.

  2. Select an existing contact flow, or create a new one.

  3. Add an Invoke AWS Lambda function block, then choose the title of the block to open the settings for the block.

  4. Add the Function ARN to your AWS Lambda function that retrieves customer data from your internal system.

  5. After the Invoke AWS Lambda function block, add a Set contact attributes block and connect the Success branch of the Invoke AWS Lambda function block to it.

  6. Edit the Set contact attributes block, and select Use attribute.

  7. For Destination key, type a name to use as a reference to the attribute, such as customerName. This is the value you use in the Attribute field in other blocks to reference this attribute.

  8. For the Type, choose External.

  9. For Attribute type the name of the attribute returned from the Lambda function. The name of the attribute returned from the function will vary depending on your internal system and the function you use.

After this block executes during a contact flow, the value is saved as a user-defined attribute with the name specified by the Destination key, in this case customerName. It can be accessed in any block that uses dynamic attributes.

To branch your contact flow based on the value of an external attribute, such as an account number, use a Check contact attributes block, and then add a condition to compare the value of the attribute to. Next, branch the contact flow based on the condition.

  1. In the Check contact attributes block, for Attribute to check do one of the following:

    • Select External for the Type, then enter the key name returned from the Lambda function in the Attribute field.


      Any attribute returned from an AWS Lambda function is overwritten with the next function invocation. To reference them later in a contact flow, store them as user-defined attributes.

    • Select User Defined for the Type, and in the Attribute field, type the name that you specified as the Destination key in the Set contact attributes block.

  2. Choose Add another condition.

  3. Under Conditions to check, choose the operator for the condition, then enter a value to compare to the attribute value. A branch is created for each comparison you enter, letting you route the contact based on the conditions specified. If no condition is matched, the contact takes the No Match branch from the block.