Error "App configuration is not valid • []: Invalid input" when testing payments_extension with `shopify app dev`

Extensions
1

:waving_hand: Hello! I’m developing a payments_extension (offsite) using the Shopify CLI.

When I run the command:
shopify app dev

CLI version: 3.69.0

I get this error in the terminal when Shopify tries to preview or load the extension:

Error while deploying updated extension draft: App configuration is not valid
Validation errors in extensions/test-offsite-payment/shopify.extension.toml:

• : Invalid input

Has anyone seen this error during local development? Any advice or ideas would be greatly appreciated :folded_hands:

Thanks in advance for your time and help!

Here’s my current shopify.extension.toml file:

api_version = “2025-04”

[[extensions]]
name = “test-offsite-payment”
handle = “test-offsite-payment”
type = “payments_extension”

merchant_label = “Offsite Payments App Extension”
buyer_label = “Payments App”
payment_session_url = “https://run.mocky.io/v3/72facaa3-0cc0-47b9-91f8-04a9b5202d7d”
supported_countries = [“CO”]
supported_payment_methods = [“visa”]
supports_oversell_protection = false
supports_3ds = false
supports_installments = false
supports_deferred_payments = false
test_mode_available = true

[[extensions.targeting]]
target = “payments.offsite.render”

1 Like
2

Hey @alvaroatunes :waving_hand: - thanks for sharing your .toml config there - from what I can tell using the docs here as a reference, your config does look correct to me.

Could you try running shopify app dev --verbose and sharing the verbose output here in the thread? I can take a look at that and see if we can pinpoint exactly where the validation is failing.

3

Thanks so much for the reply, Alan! :folded_hands: I ran shopify app dev --verbose as you suggested and here’s the output:

15:53:18 │ test-offsite-payment │ 2025-04-24T20:53:18.405Z: Extension file at path /Users/test-offsite-payment-app/extensions/test-offsite-payment/shopify.extension.toml changed
2025-04-24T20:53:18.409Z: Reading the content of file at extensions/test-offsite-payment/shopify.extension.toml…
2025-04-24T20:53:18.409Z: Reading the content of file at extensions/test-offsite-payment/shopify.extension.toml…
15:53:18 │ test-offsite-payment │ Error while deploying updated extension draft: App configuration is not valid
15:53:18 │ test-offsite-payment │ Validation errors in extensions/test-offsite-payment/shopify.extension.toml:
15:53:18 │ test-offsite-payment │
15:53:18 │ test-offsite-payment │ • : Invalid input
15:53:18 │ test-offsite-payment │
2025-04-24T20:53:20.740Z: Sending “Partners” GraphQL request:
query FindAppPreviewMode($apiKey: String!) {
app(apiKey: $apiKey) {
developmentStorePreviewEnabled
}
}

With variables:
{
“apiKey”: “*****”
}

With request headers:
• User-Agent: Shopify CLI; v=3.69.0
• Keep-Alive: timeout=30
• Sec-CH-UA-PLATFORM: darwin
• Content-Type: application/json

2025-04-24T20:53:21.300Z: Request to https://partners.shopify.com/api/cli/graphql completed in 557 ms
With response headers:
• cache-control: max-age=0, private, must-revalidate
• content-type: application/json; charset=utf-8
• etag: W/“f9e834f7231872722829cb9dec035749”
• server-timing: processing;dur=288, socket_queue;dur=2.495, util;dur=0.7, cfRequestDuration;dur=368.999958
• x-request-id: 8abcbe88-abc8-42ba-abb4-421318835a29-1745528000

2025-04-24T20:53:25.740Z: Sending “Partners” GraphQL request:
query FindAppPreviewMode($apiKey: String!) {
app(apiKey: $apiKey) {
developmentStorePreviewEnabled
}
}

With variables:
{
“apiKey”: “*****”
}

With request headers:
• User-Agent: Shopify CLI; v=3.69.0
• Keep-Alive: timeout=30
• Sec-CH-UA-PLATFORM: darwin
• Content-Type: application/json

Thanks again for your help!