1 files changed, 35 insertions, 0 deletions
diff --git a/api-merchant.rst b/api-merchant.rst
index 43c0a7c3..c8fc2c10 100644
--- a/api-merchant.rst
+++ b/api-merchant.rst
@@ -280,3 +280,38 @@ The following API are made available by the merchant's backend to the merchant's
    :reqheader Content-Type: application/json
    :<json base32 dep_perm: the signed deposit permission (link to the blob above)
    :<json base32 eddsa_pub: the public key of the customer.
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+  **Failure Response: TBD **
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+  **Error Response: Invalid signature**:
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+  :status 401 Unauthorized: One of the signatures is invalid.
+  :resheader Content-Type: application/json
+  :>json string error: the value is "invalid signature"
+  :>json string paramter: the value is "coin_sig", "ub_sig" (TODO define this) or "wallet_sig", depending on which signature was deemed invalid by the mint
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