BREAKING CHANGE: add response object emptiness check (#26)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

BREAKING CHANGE:

BREAKING CHANGE: add response object emptiness check (#26)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

BREAKING CHANGE:

feat: add customer and invoice reference_id; add balances customer ac…

…tion (#24)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

feat: Update library (#23)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

Merge pull request #22 from processout/feat/add-new-operation-error-m…

…essage-field-and-latest-changes

feat: add-new-operation-error-message-field

feat: Add custom action structure to the create token flow (#20)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

BREAKING CHANGE: breaking: change response types for invoices-authori…

…ze, invoices-capture, invoices-native-payment; breaking: create/update card; add invoice expiry; add invoice qr_code; add invoice delete; add project public metadata; add hosted payment page support (#19)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

Merge pull request #17 from processout/feat/add-auto-capture-at-contr…

…ol-via-backend

feat: add auto_capture_at field within the invoice object

feat: Add create/update card request fields; SFTPSettings (#16)

Co-authored-by: ProcessOut Fountain <internal@processout.com>

feat: Add create/update card; PayoutItemAmountBreakdowns (#15)

Co-authored-by: ProcessOut Fountain <internal@processout.com>