EnrollPaymentQrCode

Dados de pagamento retornados após enroll em plano com billing_method = qr_code.

{
    "pix_code": "00020126360014BR.GOV.BCB.PIX0114+5511999999999...",
    "qr_code": null,
    "identifier": "sub_charge_abc123",
    "expires_at": "2026-07-07T09:00:00-03:00"
}