Bug: [BUG] (nuvei) 4xx error when eci_provider = nill for applepay



### Bug Description

For some card eci provider is nill .

### Expected Behavior

No error should be thrown

### Actual Behavior

-

### Steps To Reproduce

Provide an unambiguous set of steps to reproduce this bug. Include code or configuration to reproduce, if relevant.
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'


### Context For The Bug

_No response_

### Environment

Are you using hyperswitch hosted version? Yes/No
If yes, please provide the value of the `x-request-id` response header to help us debug your issue.

If not (or if building/running locally), please provide the following details:
1. Operating System or Linux distribution:
2. Rust version (output of `rustc --version`): ``
3. App version (output of `cargo r --features vergen -- --version`): ``


### Have you spent some time checking if this bug has been raised before?

- [x] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [x] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

None
diff --git a/crates/hyperswitch_connectors/src/connectors/nuvei/transformers.rs b/crates/hyperswitch_connectors/src/connectors/nuvei/transformers.rs
index 1329bd0a056..39776916056 100644
--- a/crates/hyperswitch_connectors/src/connectors/nuvei/transformers.rs
+++ b/crates/hyperswitch_connectors/src/connectors/nuvei/transformers.rs
@@ -1221,15 +1221,7 @@ fn get_apple_pay_decrypt_data(
                             .online_payment_cryptogram
                             .clone(),
                     ),
-                    eci_provider: Some(
-                        apple_pay_predecrypt_data
-                            .payment_data
-                            .eci_indicator
-                            .clone()
-                            .ok_or_else(missing_field_err(
-                                "payment_method_data.wallet.apple_pay.payment_data.eci_indicator",
-                            ))?,
-                    ),
+                    eci_provider: apple_pay_predecrypt_data.payment_data.eci_indicator.clone(),
                 }),
                 ..Default::default()
             }),

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Some cards have optional `eci_provider` which causes 4xx missing  field error. Make that optional.

### Test : 

### Request

```json
{
    "amount": 6500,
    "currency": "USD",
    "email": "email4@gmail.com",
    "customer_id": "hello5",
    "capture_method": "automatic",
    "confirm": true,
    "return_url": "https://hyperswitch-demo-store.netlify.app/?isTestingMode=true&hyperswitchClientUrl=https://beta.hyperswitch.io/v1&hyperswitchCustomPodUri=&hyperswitchCustomBackendUrl=&publishableKey=pk_snd_e6c328fa58824247865647d532583e66&secretKey=snd_H0f0rZqfaXlv6kz81O6tQptd2e250u5vlFsA1L50ogMglapamZmDzJ7qRlj4mNlM&profileId=pro_PxNHqEwbZM6rbIfgClSg&environment=Sandbox",
     "billing": {
        "address": {
            "zip": "560095",
            "country": "US",
            "first_name": "Sakil",
            "last_name": "Mostak",
            "line1": "Fasdf",
            "line2": "Fasdf",
            "city": "Fasdf"
        }
    },
    "payment_method_data": {
        "wallet": {
            "apple_pay": {
                "payment_data": "eyJkYXRhIjoiSWRNbUFu***************d****************2NDQ5NDlmMWUxNGZiYmM4NTdiNjk5N2NkYWJlMzczZGEyOTI3ZmU5NzcifSwidmVyc2lvbiI6IkVDX3YxIn0=",
                "payment_method": {
                    "display_name": "Visa 0492",
                    "network": "Visa",
                    "type": "debit"
                },
                "transaction_identifier": "85ea39d59610a6860eb723644949f1e14fbbc857b6997cdabe373da2927fe977"
            }
        }
    },
    "payment_method": "wallet",
    "payment_method_type": "apple_pay",
    "connector": [
        "nuvei"
    ],
    "browser_info": {
        "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Safari/605.1.15",
        "accept_header": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
        "language": "en-US",
        "color_depth": 24,
        "screen_height": 1117,
        "screen_width": 1728,
        "ip_address": "192.168.1.1",
        "time_zone": -330,
        "java_enabled": true,
        "java_script_enabled": true,
        "device_model": "Macintosh",
        "os_type": "macOS",
        "os_version": "10.15.7"
    },
    "payment_type": "normal"
}
```
### response

```json
{
    "payment_id": "pay_7wu0YSHTd8LFDE8KD2UN",
    "merchant_id": "merchant_1758115709",
    "status": "succeeded",
    "amount": 6500,
    "net_amount": 6500,
    "shipping_cost": null,
    "amount_capturable": 0,
    "amount_received": 6500,
    "connector": "nuvei",
    "client_secret": "pay_7wu0YSHTd8LFDE8KD2UN_secret_kIWxoLIlS4kexcOCmHz1",
    "created": "2025-09-18T07:35:21.765Z",
    "currency": "USD",
    "customer_id": "hello5",
    "customer": {
        "id": "hello5",
        "name": null,
        "email": "email4@gmail.com",
        "phone": null,
        "phone_country_code": null
    },
    "description": null,
    "refunds": null,
    "disputes": null,
    "mandate_id": null,
    "mandate_data": null,
    "setup_future_usage": null,
    "off_session": null,
    "capture_on": null,
    "capture_method": "automatic",
    "payment_method": "wallet",
    "payment_method_data": {
        "wallet": {
            "apple_pay": {
                "last4": "0492",
                "card_network": "Visa",
                "type": "debit"
            }
        },
        "billing": null
    },
    "payment_token": null,
    "shipping": null,
    "billing": {
        "address": {
            "city": "Fasdf",
            "country": "US",
            "line1": "Fasdf",
            "line2": "Fasdf",
            "line3": null,
            "zip": "560095",
            "state": null,
            "first_name": "Sakil",
            "last_name": "Mostak",
            "origin_zip": null
        },
        "phone": null,
        "email": null
    },
    "order_details": null,
    "email": "email4@gmail.com",
    "name": null,
    "phone": null,
    "return_url": "https://hyperswitch-demo-store.netlify.app/?isTestingMode=true&hyperswitchClientUrl=https://beta.hyperswitch.io/v1&hyperswitchCustomPodUri=&hyperswitchCustomBackendUrl=&publishableKey=pk_snd_e6c328fa58824247865647d532583e66&secretKey=snd_H0f0rZqfaXlv6kz81O6tQptd2e250u5vlFsA1L50ogMglapamZmDzJ7qRlj4mNlM&profileId=pro_PxNHqEwbZM6rbIfgClSg&environment=Sandbox",
    "authentication_type": "no_three_ds",
    "statement_descriptor_name": null,
    "statement_descriptor_suffix": null,
    "next_action": null,
    "cancellation_reason": null,
    "error_code": null,
    "error_message": null,
    "unified_code": null,
    "unified_message": null,
    "payment_experience": null,
    "payment_method_type": "apple_pay",
    "connector_label": null,
    "business_country": null,
    "business_label": "default",
    "business_sub_label": null,
    "allowed_payment_method_types": null,
    "ephemeral_key": {
        "customer_id": "hello5",
        "created_at": 1758180921,
        "expires": 1758184521,
        "secret": "epk_228ed6b0222a461b9497d73df63c5e11"
    },
    "manual_retry_allowed": null,
    "connector_transaction_id": "7110000000017082220",
    "frm_message": null,
    "metadata": null,
    "connector_metadata": null,
    "feature_metadata": {
        "redirect_response": null,
        "search_tags": null,
        "apple_pay_recurring_details": null,
        "gateway_system": "direct"
    },
    "reference_id": "8937234111",
    "payment_link": null,
    "profile_id": "pro_G0scDt6GAZBxs3brIkts",
    "surcharge_details": null,
    "attempt_count": 1,
    "merchant_decision": null,
    "merchant_connector_id": "mca_4ioDaxsfaPf9R3aZCrE6",
    "incremental_authorization_allowed": false,
    "authorization_count": null,
    "incremental_authorizations": null,
    "external_authentication_details": null,
    "external_3ds_authentication_attempted": false,
    "expires_on": "2025-09-18T07:50:21.765Z",
    "fingerprint": null,
    "browser_info": {
        "os_type": "macOS",
        "language": "en-US",
        "time_zone": -330,
        "ip_address": "192.168.1.1",
        "os_version": "10.15.7",
        "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Safari/605.1.15",
        "color_depth": 24,
        "device_model": "Macintosh",
        "java_enabled": true,
        "screen_width": 1728,
        "accept_header": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
        "screen_height": 1117,
        "java_script_enabled": true
    },
    "payment_channel": null,
    "payment_method_id": null,
    "network_transaction_id": "",
    "payment_method_status": null,
    "updated": "2025-09-18T07:35:25.366Z",
    "split_payments": null,
    "frm_metadata": null,
    "extended_authorization_applied": null,
    "capture_before": null,
    "merchant_order_reference_id": null,
    "order_tax_amount": null,
    "connector_mandate_id": null,
    "card_discovery": null,
    "force_3ds_challenge": false,
    "force_3ds_challenge_trigger": false,
    "issuer_error_code": null,
    "issuer_error_message": null,
    "is_iframe_redirection_enabled": null,
    "whole_connector_response": null,
    "enable_partial_authorization": null,
    "enable_overcapture": null,
    "is_overcapture_enabled": null,
    "network_details": null
}
```

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

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2. `crates/router/src/configs`
3. `loadtest/config`
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## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
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## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
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## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
