In order to connect Amazon SP-API to API2Cart account, you need to fill out the credentials, which is shown in the screenshot below:

The seller account that is planned to be connected to API2Cart must have an active "Professional" selling plan.

We recommend reading the original guide from the Amazon Selling Partner API Developer Guide.

1. amazon_seller_id - can be seen in Sellercentral -> Settings -> Account Info -> Business Information -> Merchant Token. Direct link: https://sellercentral.amazon.com/sw/AccountInfo/MerchantToken/step/MerchantToken

2. In order to make calls to the Amazon SP API, you must have an AWS account. If you do not have it, then you can register it here - AWS Free Tier.

If you already have an AWS account, you can proceed to the stage of obtaining the following credentials:

• amazon_sp_aws_user_key_id
• amazon_sp_aws_user_secret
• amazon_sp_aws_region
• amazon_sp_aws_role_arn

3. Create an IAM user

Go to https://console.aws.amazon.com/iam/home#/users and follow the steps as shown below:

4. Create an IAM policy

Select the JSON tab, and insert the following code:

{
    "Version": "2012-10-17",
         "Statement": [
            {
                "Effect": "Allow",
                     "Action": "execute-api:Invoke",
                        "Resource": "arn:aws:execute-api:*:*:*"
            }
                    ]
}

5. Create an IAM role

Go to https://console.aws.amazon.com/iam/home#/roles

Open the newly created role and save Role ARN.

6. Add an AWS Security Token Service policy to your IAM user

7. To determine which value should be substituted into amazon_sp_aws_region you need to use the table Selling Partner API endpoints.

For example, if the seller sells in the US, you must select us-east-1.

8. To get amazon_sp_client_id and amazon_sp_client_secret you need to go to an Amazon seller account registered as a developer. If there is no such an account, you have to register a seller account, and then register in it as a developer here - Register as a developer.

Go to Developer Central and add a new client.

Click “View” to see amazon_sp_client_id and amazon_sp_client_secret.

9. To get the last parameter - amazon_sp_refresh_token you need to implement OAuth authentication in one of the following ways:

1. Website workflow
2. Marketplace Appstore workflow
3. Self authorization

Let's consider the 3rd way, it is the most convenient when you need to quickly get an amazon_sp_refresh_token to test the work.

10. Now, when you have all the necessary credentials, you can add a store in API2Cart.