Bamboo.SesAdapter.set_template_params

You're seeing just the function set_template_params, go back to Bamboo.SesAdapter module for more information.
Link to this function

set_template_params(mail, template_name, template_data, template_arn \\ nil)

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Set the SES template params: name, data, ARN

Example

template_data = Jason.encode!(%{subject: "My subject", html: "<b>Bold text</b>", text: "Text"})

email
|> Bamboo.SesAdapter.set_template_params("my-template", template_data)

# or with template ARN
email
|> Bamboo.SesAdapter.set_template_params("my-template", template_data, "TEMPLATE ARN")