List buyer payment methods

let gr4vy = try Gr4vy(
    gr4vyId: "example",
    token: "your_jwt_token",
    merchantId: "merchant_123", // Set the default merchant ID
    server: .sandbox,
    debugMode: true
)

// Create payment methods criteria
let paymentMethods = Gr4vyBuyersPaymentMethods(
    buyerId: "buyer_123",
    buyerExternalIdentifier: "external_456",
    sortBy: .lastUsedAt,
    orderBy: .desc,
    country: "US",
    currency: "USD"
)

// Create request
let request = Gr4vyBuyersPaymentMethodsRequest(
    paymentMethods: paymentMethods,
    merchantId: "merchant_123", // Optional
    timeout: 30.0
)

// Async/await
do {
    let paymentMethodsList = try await gr4vy.paymentMethods.list(request: request)
    print("Found \(paymentMethodsList.count) payment methods")
} catch {
    print("Error fetching payment methods: \(error)")
}

// Completion handler
gr4vy.paymentMethods.list(request: request) { result in
    switch result {
    case .success(let paymentMethodsList):
        print("Found \(paymentMethodsList.count) payment methods")
    case .failure(let error):
        print("Error fetching payment methods: \(error)")
    }
}

val gr4vy = Gr4vy(
    gr4vyId = "example",
    token = "your_jwt_token",
    merchantId = "merchant_123", // Set the default merchant ID
    server = Gr4vyServer.SANDBOX,
    debugMode = true
)

// Create payment methods criteria
val paymentMethods = Gr4vyBuyersPaymentMethods(
    buyerId = "buyer_123",
    buyerExternalIdentifier = "external_456",
    sortBy = Gr4vySortBy.LAST_USED_AT.value,
    orderBy = Gr4vyOrderBy.DESC.value,
    country = "US",
    currency = "USD"
)

// Create request
val request = Gr4vyBuyersPaymentMethodsRequest(
    merchantId = "merchant_123", // Optional
    timeout = 30.0,
    paymentMethods = paymentMethods
)

// Suspend function
lifecycleScope.launch {
    try {
        val paymentMethodsList = gr4vy.paymentMethods.list(request)
        println("Found ${paymentMethodsList.data.items.size} payment methods")
    } catch (error: Gr4vyError) {
        println("Error fetching payment methods: $error")
    }
}

// Callback version
gr4vy.paymentMethods.list(request) { result ->
    when {
        result.isSuccess -> {
            val paymentMethodsList = result.getOrNull()
            println("Found ${paymentMethodsList?.data?.items?.size} payment methods")
        }
        result.isFailure -> {
            println("Error fetching payment methods: ${result.exceptionOrNull()}")
        }
    }
}