Para realizar um cancelamento, crie um JSON seguindo o formato definido abaixo e converta-o para Base64:

{
  "id": "id da ordem",
  "clientID": "seu client-ID",
  "accessToken": "seu access token",
  "cieloCode": "123",
  "authCode": "123",
  "value": 1000
}

É preciso definir o contrato de resposta. Aqui, será utilizada essa configuração no parâmetro urlCallback. A chamada de cancelamento deve ser feita da seguinte forma:

var base64 = getBase64(jsonString)
var checkoutUri ="lio://payment-reversal?request=$base64&urlCallback=order://response"

Para recuperar os dados, basta acessar a intent recebida na activity de resposta, que deve estar registrada no seu AndroidManifest.xml. Em seguida, utilize o parâmetro data da intent para acessar a URI:

val responseIntent = intent
if (Intent.ACTION_VIEW == responseIntent.action) {
   val uri = responseIntent.data
   val response = uri.getQueryParameter("response")
   val data = Base64.decode(response, Base64.DEFAULT)
   val json = String(data)
}

Exemplos de retorno

Retorno de sucesso

order://response?response=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&responsecode=0

Retorno de erro

Em caso de falha, o retorno virá como no exemplo abaixo:

order://response?response=eyJjb2RlIjoxLCJyZWFzb24iOiJDQU5DRUxBRE8gUEVMTyBVU1XDgVJJTyJ9&responsecode=0

Após a decodificação da string Base64, o conteúdo é convertido em um objeto JSON estruturado, que facilita a interpretação do erro:

{ 
   "code":1, 
   "reason":"CANCELADO PELO USUÁRIO" 
}