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diff --git a/src/lib/testing_api_cmd_pay_abort_refund.c b/src/lib/testing_api_cmd_pay_abort_refund.c
new file mode 100644
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+++ b/src/lib/testing_api_cmd_pay_abort_refund.c
@@ -0,0 +1,255 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014-2018 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 3, or
+  (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public
+  License along with TALER; see the file COPYING.  If not, see
+  <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file lib/testing_api_cmd_pay_abort_refund.c
+ * @brief command to test the pay-abort-refund feature.
+ * @author Marcello Stanisci
+ */
+#include "platform.h"
+#include <taler/taler_exchange_service.h>
+#include <taler/taler_testing_lib.h>
+#include <taler/taler_signatures.h>
+#include "taler_merchant_service.h"
+#include "taler_merchant_testing_lib.h"
+
+
+/**
+ * State for a "pay abort refund" CMD.  This command
+ * takes the refund permissions from a "pay abort" CMD,
+ * and redeems those at the exchange.
+ */
+struct PayAbortRefundState
+{
+
+  /**
+   * "abort" CMD that will provide with refund permissions.
+   */
+  const char *abort_reference;
+
+  /**
+   * Expected number of coins that were refunded.
+   * Only used to counter-check, not to perform any
+   * operation.
+   */
+  unsigned int num_coins;
+
+  /**
+   * The amount to be "withdrawn" from the refund session.
+   */
+  const char *refund_amount;
+
+  /**
+   * The refund fee (charged to the merchant).
+   */
+  const char *refund_fee;
+
+  /**
+   * The interpreter state.
+   */
+  struct TALER_TESTING_Interpreter *is;
+
+  /**
+   * Handle to the refund operation.
+   */
+  struct TALER_EXCHANGE_RefundHandle *rh;
+
+  /**
+   * Expected HTTP response code.
+   */
+  unsigned int http_status;
+};
+
+
+/**
+ * Callback used to work out the response from the exchange
+ * to a refund operation.  Currently only checks if the response
+ * code is as expected.
+ *
+ * @param cls closure
+ * @param http_status HTTP response code, #MHD_HTTP_OK (200) for
+ *        successful deposit; 0 if the exchange's reply is bogus
+ *        (fails to follow the protocol)
+ * @param ec taler-specific error code, #TALER_EC_NONE on success
+ * @param sign_key exchange key used to sign @a obj, or NULL
+ * @param obj the received JSON reply, should be kept as proof
+ *        (and, in particular, be forwarded to the customer)
+ */
+static void
+abort_refund_cb (void *cls,
+                 unsigned int http_status,
+                 enum TALER_ErrorCode ec,
+                 const struct TALER_ExchangePublicKeyP *sign_key,
+                 const json_t *obj)
+{
+  struct PayAbortRefundState *pars = cls;
+
+  pars->rh = NULL;
+  if (pars->http_status != http_status)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u (%d) to command %s\n",
+                http_status,
+                ec,
+                TALER_TESTING_interpreter_get_current_label
+                  (pars->is));
+    TALER_TESTING_interpreter_fail (pars->is);
+    return;
+  }
+  TALER_TESTING_interpreter_next (pars->is);
+}
+
+
+/**
+ * Free the state of a "pay abort refund" CMD, and possibly
+ * cancel a pending operation.
+ *
+ * @param cls closure.
+ * @param cmd the command currently being freed.
+ */
+static void
+pay_abort_refund_cleanup (void *cls,
+                          const struct TALER_TESTING_Command *cmd)
+{
+  struct PayAbortRefundState *pars = cls;
+
+  if (NULL != pars->rh)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                "Command `%s' did not complete.\n",
+                TALER_TESTING_interpreter_get_current_label (
+                  pars->is));
+    TALER_EXCHANGE_refund_cancel (pars->rh);
+  }
+  GNUNET_free (pars);
+}
+
+
+/**
+ * Run a "pay abort refund" CMD.
+ *
+ * @param cls closure.
+ * @param cmd command currently being run.
+ * @param is interpreter state.
+ */
+static void
+pay_abort_refund_run (void *cls,
+                      const struct TALER_TESTING_Command *cmd,
+                      struct TALER_TESTING_Interpreter *is)
+{
+  struct PayAbortRefundState *pars = cls;
+  struct TALER_Amount refund_fee;
+  struct TALER_Amount refund_amount;
+  const struct TALER_MERCHANT_RefundEntry *refund_entry;
+  const unsigned int *num_refunds;
+  const struct TALER_TESTING_Command *abort_cmd;
+  const struct GNUNET_CRYPTO_EddsaPublicKey *merchant_pub;
+  const struct GNUNET_HashCode *h_contract_terms;
+
+  pars->is = is;
+  if (NULL ==
+      (abort_cmd =
+         TALER_TESTING_interpreter_lookup_command (is,
+                                                   pars->abort_reference)) )
+    TALER_TESTING_FAIL (is);
+  if (GNUNET_OK !=
+      TALER_TESTING_get_trait_uint (abort_cmd,
+                                    0,
+                                    &num_refunds))
+    TALER_TESTING_FAIL (is);
+  if (pars->num_coins >= *num_refunds)
+    TALER_TESTING_FAIL (is);
+  if (GNUNET_OK !=
+      TALER_TESTING_get_trait_h_contract_terms (abort_cmd,
+                                                0,
+                                                &h_contract_terms))
+    TALER_TESTING_FAIL (is);
+  if (GNUNET_OK !=
+      TALER_TESTING_get_trait_peer_key_pub (abort_cmd,
+                                            0,
+                                            &merchant_pub))
+    TALER_TESTING_FAIL (is);
+  if (GNUNET_OK !=
+      TALER_TESTING_get_trait_refund_entry (abort_cmd,
+                                            0,
+                                            &refund_entry))
+    TALER_TESTING_FAIL (is);
+  GNUNET_assert (GNUNET_OK ==
+                 TALER_string_to_amount (pars->refund_amount,
+                                         &refund_amount));
+  GNUNET_assert (GNUNET_OK ==
+                 TALER_string_to_amount (pars->refund_fee,
+                                         &refund_fee));
+  pars->rh = TALER_EXCHANGE_refund2
+               (is->exchange,
+               &refund_amount,
+               &refund_fee,
+               h_contract_terms,
+               &refund_entry->coin_pub,
+               refund_entry->rtransaction_id,
+               (const struct TALER_MerchantPublicKeyP *) merchant_pub,
+               &refund_entry->merchant_sig,
+               &abort_refund_cb,
+               pars);
+  GNUNET_assert (NULL != pars->rh);
+}
+
+
+/**
+ * Make a "pay abort refund" CMD.  This command uses the
+ * refund permission from a "pay abort" CMD, and redeems it
+ * at the exchange.
+ *
+ * @param label command label.
+ * @param abort_reference reference to the "pay abort" CMD that
+ *        will offer the refund permission.
+ * @param num_coins how many coins are expected to be refunded.
+ * @param refund_amount the amount we are going to redeem as
+ *        refund.
+ * @param refund_fee the refund fee (merchant pays it)
+ * @param http_status expected HTTP response code.
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_pay_abort_refund
+  (const char *label,
+  const char *abort_reference,
+  unsigned int num_coins,
+  const char *refund_amount,
+  const char *refund_fee,
+  unsigned int http_status)
+{
+  struct PayAbortRefundState *pars;
+
+  pars = GNUNET_new (struct PayAbortRefundState);
+  pars->abort_reference = abort_reference;
+  pars->num_coins = num_coins;
+  pars->refund_amount = refund_amount;
+  pars->refund_fee = refund_fee;
+  pars->http_status = http_status;
+  {
+    struct TALER_TESTING_Command cmd = {
+      .cls = pars,
+      .label = label,
+      .run = &pay_abort_refund_run,
+      .cleanup = &pay_abort_refund_cleanup
+    };
+
+    return cmd;
+  }
+}