Collect invoice amounts in Google Sheets

Plan Gmail, Drive and Sheets together: documented writes, missing invoice recognition and checks that help prevent duplicate rows.

Content updated: 2026-09-08

Does this route fit?

This plan separates moving a document from understanding an invoice. The APIs document file storage and row append; document classification and amount/currency extraction are not established by the provider catalog.

Blocked: required steps are not documented.

5/7 steps backed by API documentation.

Required apps

• Gmail
• Google Drive
• Google Sheets

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Setup and a small test

1. Define columns for provenance, invoice number, amount and currency. Do not infer decimal notation or currency from filenames.

2. Look for existing provenance before appending. A resent invoice requires a business decision about duplicates even when its message ID is new.

3. Read rows and values back after writing. If the response is lost, check whether the write reached the destination before retrying.

Steps and evidence

1. Search messages

   Gmail

   Technically inspected · Workflow not yet practically tested

   Details

   Provider API: gmail.users.messages.list

   GET gmail/v1/users/{userId}/messages

   Permissions

   Documented scope alternatives

   • https://mail.google.com/
   • https://www.googleapis.com/auth/gmail.metadata
   • https://www.googleapis.com/auth/gmail.modify
   • https://www.googleapis.com/auth/gmail.readonly

   Do not request all scopes. Select the least privileged scope that covers the operation and resource.

   Costs and limits

   The provider describes standard use or use below its daily threshold without an additional API fee and announces future overage charges. Account, storage and connector costs may apply separately. Total cost has not been checked.

   Source · 2026-09-08T08:42:36.413378+00:00

   Quotas apply per project and user. Check the limits assigned to your project; older Google projects may retain different quotas.

   Source · Last confirmed: 2026-09-07T12:11:14.527104+00:00

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2. Read a message

   Gmail

   Technically inspected · Workflow not yet practically tested

   Details

   Provider API: gmail.users.messages.get

   GET gmail/v1/users/{userId}/messages/{id}

   Permissions

   Documented scope alternatives

   • https://mail.google.com/
   • https://www.googleapis.com/auth/gmail.addons.current.message.action
   • https://www.googleapis.com/auth/gmail.addons.current.message.metadata
   • https://www.googleapis.com/auth/gmail.addons.current.message.readonly
   • https://www.googleapis.com/auth/gmail.metadata
   • https://www.googleapis.com/auth/gmail.modify
   • https://www.googleapis.com/auth/gmail.readonly

   Do not request all scopes. Select the least privileged scope that covers the operation and resource.

   Costs and limits

   The provider describes standard use or use below its daily threshold without an additional API fee and announces future overage charges. Account, storage and connector costs may apply separately. Total cost has not been checked.

   Source · 2026-09-08T08:42:36.413378+00:00

   Quotas apply per project and user. Check the limits assigned to your project; older Google projects may retain different quotas.

   Source · Last confirmed: 2026-09-07T12:11:14.527104+00:00

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3. Download an attachment

   Gmail

   Technically inspected · Workflow not yet practically tested

   Details

   Provider API: gmail.users.messages.attachments.get

   GET gmail/v1/users/{userId}/messages/{messageId}/attachments/{id}

   Permissions

   Documented scope alternatives

   • https://mail.google.com/
   • https://www.googleapis.com/auth/gmail.addons.current.message.action
   • https://www.googleapis.com/auth/gmail.addons.current.message.readonly
   • https://www.googleapis.com/auth/gmail.modify
   • https://www.googleapis.com/auth/gmail.readonly

   Do not request all scopes. Select the least privileged scope that covers the operation and resource.

   Data transfer between steps

   • Decode the base64url data field before sending bytes to a file API.

   Costs and limits

   The provider describes standard use or use below its daily threshold without an additional API fee and announces future overage charges. Account, storage and connector costs may apply separately. Total cost has not been checked.

   Source · 2026-09-08T08:42:36.413378+00:00

   Quotas apply per project and user. Check the limits assigned to your project; older Google projects may retain different quotas.

   Source · Last confirmed: 2026-09-07T12:11:14.527104+00:00

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4. Classify a document

   Not documented

5. Extract amount and currency

   Not documented

6. Upload a file

   Google Drive

   Technically inspected · Workflow not yet practically tested

   Details

   Provider API: drive.files.create

   POST /upload/drive/v3/files

   Permissions

   Documented scope alternatives

   • https://www.googleapis.com/auth/drive
   • https://www.googleapis.com/auth/drive.appdata
   • https://www.googleapis.com/auth/drive.file

   Do not request all scopes. Select the least privileged scope that covers the operation and resource.

   Data transfer between steps

   • Create a multipart request containing file metadata and the downloaded attachment bytes.

   Costs and limits

   The provider describes standard use or use below its daily threshold without an additional API fee and announces future overage charges. Account, storage and connector costs may apply separately. Total cost has not been checked.

   Source · 2026-09-08T08:42:37.460330+00:00

   Quotas apply per project and user. Check the limits assigned to your project; older Google projects may retain different quotas.

   Source · Last confirmed: 2026-09-07T12:11:14.800083+00:00

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7. Append rows

   Google Sheets

   Technically inspected · Workflow not yet practically tested

   Details

   Provider API: sheets.spreadsheets.values.append

   POST v4/spreadsheets/{spreadsheetId}/values/{range}:append

   Permissions

   Documented scope alternatives

   • https://www.googleapis.com/auth/drive
   • https://www.googleapis.com/auth/drive.file
   • https://www.googleapis.com/auth/spreadsheets

   Do not request all scopes. Select the least privileged scope that covers the operation and resource.

   Costs and limits

   The provider describes standard use or use below its daily threshold without an additional API fee and announces future overage charges. Account, storage and connector costs may apply separately. Total cost has not been checked.

   Source · 2026-09-08T08:42:41.649039+00:00

   Quotas apply per project and user. Check the limits assigned to your project; older Google projects may retain different quotas.

   Source · Last confirmed: 2026-09-07T12:11:15.359191+00:00

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Tests and limitations

The runner reads amount and currency from its fixed XML fixture. It writes a selected range, so it proves neither general invoice extraction nor the append behavior in this plan. Real Google provider tests remain outstanding.

Public verification reports · Open the local runner and instructions

Alternatives

Manually confirmed values can use the same spreadsheet. Excel has a separate plan because its table operations and permission conditions differ.

Open the matching plan · All tasks