International Transactions, Ltd. (“ITL”) challenges the dismissal of its action to confirm an arbitration award against Em-botelladora Agral Regiomontana, S.A. de C.V.; Embotelladora Agral De La Laguna, S.A. de C.V.; Agral Arrendadora, S.A. de C.V.; Agral Comisionista Y Distribuidora, S.A. de C.V.; and Agral Inmobiliaria, S.A. de C.V. (the “Agral Companies”). The district court dismissed the case based on its conclusion that ITL lacked standing to collect the arbitration award based on an order of a Mexican bankruptcy court in the insolvency proceedings of several of the *591Agral Companies. The Mexican bankruptcy court held that ITL’s representative, Sharp Capital, Inc. (“Sharp”), had assigned the award to a third party and Sharp had released any interest it held in the award. The district court concluded that this decision was entitled to comity and required dismissal of ITL’s claims for lack of standing. Based on our conclusion that the Agral Companies failed to demonstrate that ITL and/or Sharp was afforded notice and an opportunity to be heard in the proceedings leading to the Mexican court’s decision, we vacate and remand.
I.
In May of 1994, ITL made an investment in one of the Agral companies, Em-botelladora Agral Regiomontana, S.A. de C.V. (“Embotelladora”), through Sharp, its undisclosed agent. The form of the investment was a promissory note with Embotel-ladora as maker payable to NationsBank of Texas, N.A. (the “Note”). NationsBank endorsed the Note to Sharp “as custodian” without recourse. The remaining Agral Companies guaranteed the Note. ITL was not identified as Sharp’s principal and none of the parties knew ITL was involved in any way in the investment. The Note contains an arbitration clause and choice of venue clause which requires enforcement actions to be brought in Texas. The purpose of the loan was to fund the construction of a Pepsi-Cola bottling plant in Monterrey, Mexico.
In 1996, Agral defaulted on the promissory note. Sharp, at ITL’s direction, initiated arbitration proceedings against the Agral Companies in Dallas, Texas, in accordance with the provisions of the Note. On January 17, 1997, Sharp obtained an award against the Agral Companies in the amount of $11,374,859, with interest accruing at the rate of 18% compounded daily (the “Award”). ITL was not identified as the unnamed investor in the arbitration proceedings and the Award was granted to Sharp, with no indication that Sharp received the Award as “custodian”, “agent”, or any other capacity, other than principal. However, the Agral Companies were aware that Sharp was acting for another because they had sought unsuccessfully to have the “unnamed and as of yet unidentified investor” added as a party to the arbitration proceedings in a suit filed in federal court in Texas.
In February 1997, four of the five Agral Companies filed for Suspension of Payments protection in Monterrey, Mexico, under Mexican law. The proceeding was later converted to a bankruptcy. At ITL’s instruction, Sharp filed a claim in the bankruptcy proceeding for confirmation and recognition of the Award. Sharp’s attorney was appointed as provisional in-tervenor for the creditors in the Agral bankruptcy. According to the Agral Companies, under Mexican law, the role of a provisional intervenor is to represent the creditors, similar to the function of a creditors’ committee under U.S. bankruptcy law.
In August 1998, Sharp, without authority from ITL, assigned the Award and Note to Jose Trevino Cañamar, a Mexican attorney, in exchange for an account of Bridge-stone, Inc. and payment of Sharp’s legal fees. ITL believes that Mr. Cañamar is related to Sharp’s president and is the brother of the attorney Sharp hired to collect the Award for ITL. Nine days later, Mr. Cañamar assigned the Award and Note to Grupo Embotellador Norest, S.A de C.V. (“GEN”) in exchange for 55 million pesos, a fraction of the face value of the Award. GEN is an affiliate of the Agral Companies as they are all third-tier *592subsidiaries of defendant Pepsi-Gemex.1 On the same day, Sharp, Cañamar, and GEN executed a Master Agreement releasing all claims against each other and against the Agral Companies. Both assignments were duly notarized and ratified. At least the first assignment was also filed of record in Mexico.
Because of Sharp’s fraudulent business practices, in November 1998, the Securities and Exchange Commission brought an action against Sharp and its president in the Northern District of Texas. A Special Master was appointed for Sharp. Sharp’s president was indicted on fraud charges and later entered a guilty plea.
In January 1999, Sharp’s claim in the Agral bankruptcy was denied. Based on the translation in the record, it appears that the ruling was without prejudice and based on the failure of Sharp to file the Award in a proper form, either a duly authenticated original or certified copy.
In February 1999, ITL filed suit against Sharp in the Northern District of Texas. In February 2001, in response to an order of the district court in that case, Sharp’s Special Master conveyed the Award to ITL. ITL then sued the Agral Companies in the 68th Judicial District Court of Dallas County, Texas, seeking an order confirming the arbitration Award. In June 2001, the case was removed to the Northern District of Texas, Dallas Division.
In October 2001, GEN, the assignee of the Award, filed a motion in the Mexican bankruptcy proceeding to dismiss Sharp’s attorney as provisional intervenor. GEN asked the court to dismiss Sharp’s attorney from this role because Sharp, having assigned the Award away, was no longer a creditor of the Agral Companies. In a November 2001 ruling, presented in translation in the record along with the motion being ruled upon, the Mexican bankruptcy judge found that Sharp was no longer a creditor of any of the bankrupt parties. The basis of the ruling appears to be a finding that Sharp had assigned away the Award and that under the Assignments, GEN owned the Note and the Award. Since Sharp was no longer a creditor, its attorney was not a proper provisional in-tervenor for the remaining creditors, so he was dismissed and a new intervenor appointed. The motion appears to have been handled on an ex parte basis. Although by the time the motion was filed the Agral Companies had notice of both ITL’s claim to the Award and Sharp’s fraudulent activities, ITL received no notice of and was not a party to the Mexican court’s consideration of this motion. There is also no evidence in the record that Sharp, as ITL’s representative in the Mexican bankruptcy, had any notice of the motion.
In December 2001, the Agral Companies were merged into GEN. The end result of the Assignments and the merger was that the debtor under the Award and the purported owner of the Award became one. The bankruptcy proceedings were dismissed in January 2002.
The Agral Companies submitted the November 2001 order of the Mexico bankruptcy court as basis for dismissal of this suit. They argued that ITL lacked standing to pursue collection of the Award because the Award had been assigned to GEN in 1998, and because applying the principles of res judicata and international comity, the 2001 order of the Mexican should be considered as conclusive on the question of ownership of the Award.
*593The district court granted the motion to dismiss for lack of subject, matter jurisdiction for lack of standing on grounds of international comity. The court examined affidavits and other evidentiary materials submitted by the parties in making its ruling. After noting that standing requires an injury-in-fact, causation and re-dressability, the court found that ITL had sustained an injury-in-fact by its inability to collect the Award. In addressing the issue of redressability, it found that a judgment confirming the Award would not redress ITL’s injury because (1) the Award had been assigned to Cañamar and then to GEN, (2) Sharp, Cañamar, and GEN released all claims against each other and the Agral Companies, and (3) the assignments were valid based on the November 2001 decision of the Mexican bankruptcy court. ITL appeals.
II.
The district court correctly identified the three requirements for Article III standing: (1) an injury-in-fact, which is a concrete invasion of a legally protected interest; (2) a causal connection between the injury and the defendants’ conduct; and (3) a substantial likelihood that the injury will be redressed by a favorable decision. Lujan v. Defenders of Wildlife, 504 U.S. 555, 560-61, 112 S.Ct. 2130, 119 L.Ed.2d 351 (1992). The Agral Companies argue that there are three bases on which ITL should be denied standing: (1) ITL’s injury is not redressable because the relief it seeks, an order confirming the Award, will not help ITL because the Award was validly assigned to GEN; (2) ITL’s injury is not redressable because an order confirming the Award will not help ITL in light of the Mexican court’s finding that the Award was validly assigned to GEN, which decision is entitled to comity in this court; and (3) no causal relationship exists between the actions of the Agral Companies and the alleged injury, which is inability to collect the arbitration Award, because that harm was caused by Sharp by the first assignment to Cañamar or by executing the Master Agreement.
The district court’s decision to deny standing is reviewed de novo. Robison v. TCI/US West Communs., 117 F.3d 900, 904 (5th Cir.1997). The court’s decision to grant comity to the Mexican bankruptcy court’s ruling is reviewed for abuse of discretion. Allstate Life Ins. Co. v. Linter Group, Ltd., 994 F.2d 996, 999 (2d Cir.1993), cert. denied, 510 U.S. 945, 114 S.Ct. 386, 126 L.Ed.2d 334 (1993). The district court’s decision to accept, under principles of comity, the Mexican bankruptcy court’s finding that Sharp’s assignment of the Award to Cañamar and Canamar’s assignment to GEN were valid is the focus of this appeal. We now turn to that issue.
III.
Comity is “the recognition which one nation allows within its territory to the legislative, executive or judicial acts of another nation, having due regard both to international duty and convenience, and to the rights of its own citizens or of other persons who are under the protection of its laws.” Hilton v. Guyot, 159 U.S. 113, 163-64, 16 S.Ct. 139, 40 L.Ed. 95 (1895). The rationale underlying the grant of comity to a final foreign money judgment is similar to that underlying the application of res judicata to domestic judgments. Essentially, once the parties have had an opportunity to present their cases fully and fairly before a court of competent jurisdiction, the results of the litigation process should be final. Cunard S.S. Co. v. Salen Reefer Services AB, 773 F.2d 452, 457 (2d Cir.1985); Moore’s Federal Practice, § 131.11[1]. As applied to a bankruptcy *594proceeding, the extension of comity “enables the assets of a debtor to be dispersed in an equitable, orderly, and systematic manner, rather than in a haphazard, erratic or piecemeal fashion.” Cunard, 773 F.2d at 457-58. Businesses, like ITL, that voluntarily deal with foreign entities impliedly subject themselves to the laws of the foreign government under which the corporation is organized which may affect the powers and obligations of that corporation. Id. at 458. While a foreign court may not render a binding money judgment against one over whom it has no jurisdiction based solely on one’s dealings with a foreign corporation, a creditor of an insolvent foreign corporation may be required to assert its claims before a duly convened foreign bankruptcy tribunal to preserve claims against a foreign bankrupt. Id.
Under principles of international comity, a foreign court’s judgment on a matter is conclusive in a federal court when (1) the foreign judgment was rendered by a court of competent jurisdiction, which had jurisdiction over the cause and the parties, (2) the judgment is supported by due allegations and proof, (3) the relevant parties had an opportunity to be heard, (4) the foreign court follows procedural rules, and (5) the foreign proceedings are stated in a clear and formal record. Hilton, 159 U.S. at 159, 16 S.Ct. 139. Comity is an affirmative defense and the parties urging comity — the Agral Companies in this case — have the burden of proof on the issue. Allstate, 994 F.2d at 999. Although ITL challenges the district court’s decision on comity on several grounds, the critical question is whether ITL had notice and an opportunity to be heard in the Mexican bankruptcy court on its claim to the Award. Answering that question requires an analysis of what type of notice is required for this purpose.
Under the law of the United States, a foreign judgment cannot be enforced in a U.S. court unless it was obtained under a system with procedures compatible with the requirements of due process of law. Hilton, 159 U.S. at 205-06, 16 S.Ct. at 159; Bank Melli Iran v. Pahlavi, 58 F.3d 1406, 1410 (9th Cir.1995), cert. denied, 516 U.S. 989, 116 S.Ct. 519, 133 L.Ed.2d 427 (1995). Notice is an element of our notion of due process and the United States will not enforce a judgment obtained without the bare minimum requirements of notice. Ma v. Continental Bank, N.A., 905 F.2d 1073, 1076 (7th Cir.1990), cert. denied, 498 U.S. 967, 111 S.Ct. 430, 112 L.Ed.2d 414 (1990). One commentator has stated the standard thus: “[t]he polestar is whether a reasonable method of notification was employed and reasonable opportunity to be heard was afforded to the person affected.” Somportex, Ltd. v. Philadelphia Chewing Gum Corp., 453 F.2d 435, 443 (3d Cir.1971), citing Restatement (Second) Conflict of Laws, § 92 (Proposed Final Draft), 1967.
While there is no requirement that Mexican law be identical to U.S. bankruptcy law, the notice requirements in our law give us some guidance as to what notice would satisfy our concept of due process. Allstate, 994 F.2d at 999. The U.S. Bankruptcy Code defines the phrase “after notice and a hearing” and similar phrases as requiring such notice and hearings as are appropriate under the particular circumstances. 11 U.S.C. § 102(1)(A). These terms permit flexibility regarding the occasions in which a full hearing is required, while insuring that all persons who should have notice receive it. Collier on Bankruptcy, (15th ed.) ¶ 102.02. Parties in interest must receive notice and an opportunity to be heard before their interests may be adversely affected. Western Auto Supply Co. v. Savage Arms (In re *595Savage Indus.), 48 F.3d 714, 720 (1st Cir.1994). In addition, the flexible notice allowed by section 102(1)(A) does not allow ex parte relief in the absence of specific findings demonstrating that such action is appropriate under the circumstances. If an ex parte proceeding is deemed necessary, a reasonable effort is required to give advance notice to parties in interest. Collier on Bankruptcy, (15th ed.) ¶ 102.02[1], fn. 6. ITL clearly qualifies as a party in interest, which class includes a creditor (like ITL), as well as any other person with a sufficient stake in outcome of a proceeding so as to require representation. In re Am. Appliance, 272 B.R. 587 (Bankr.D.N.J.2002).
There is no dispute that ITL had notice of the Agral bankruptcy, both actual and constructive, through its agent Sharp. The Agral Companies argue that because ITL had notice of their bankruptcy proceeding, ITL cannot complain of lack of notice because it failed to file a claim. We disagree. Although ITL did not file a claim for the Award under its own name, it clearly did file a claim in the Agral bankruptcy through its agent, Sharp.
Even though neither Sharp nor ITL was given notice of the motion, the district court appeared to charge ITL with notice because ITL was aware of the pendency of the bankruptcy proceedings in which the motion was filed. ITL contends that it (either through Sharp or directly) was entitled to notice of the particular motion to dismiss Sharp’s attorney as provisional in-tervenor based on Sharp’s assignment of the award. ITL’s position is more consistent with our concept of due process and with case law on this issue. U.S. bankruptcy law speaks of notice to parties in interest in terms of notice of particular proceedings within the larger bankruptcy proceeding of the debtor. For example, Rule 3007 fixes requirements for notice of an objection to a claim. See also In re Bumper Sales, Inc., 907 F.2d 1430 (4th Cir.1990)(Secured creditor’s motion to condition use, sale, or lease of cash collateral and proceeds is “case” as term is used in 11 U.S.C. § 1109(b), rather than adversary proceeding; therefore, unsecured creditors’ committee has standing to be heard.); Remington Rand Corporation-Delaware v. Business Systems, Inc., 830 F.2d 1260 (3d Cir.1987)(Parent corporation that did not file a claim in foreign bankruptcy proceedings of its subsidiary was not required to monitor activity in that case, including motion and order to sell assets of the debtor, to protect its rights to intellectual property licensed to the bankrupt sub.) We conclude that, having filed a claim in the Agral bankruptcy proceeding, ITL or Sharp was entitled to notice of GEN’s motion to replace Sharp’s attorney as provisional intervenor because a decision on that motion clearly would affect ITL’s claim in the bankruptcy.
Under the facts of this case, we need not discuss the precise level of due process required to be given to ITL, as the record does not indicate that any notice was given. We see nothing in the record, the district court’s opinion or any of the briefs which supports a conclusion that this motion was not handled, as ITL claims, on an ex parte basis.
We fully accept that ITL would be bound by notices issued in the bankruptcy proceeding to its agent, Sharp, and that ITL’s obligation to act to preserve its rights did not stop with the filing of the claim by Sharp. No later than November 1998, ITL should have been on notice that Sharp could no longer be trusted to advance its interests since the SEC had appointed a Special Master to oversee Sharp’s affairs. ITL also had some notice, though perhaps not timely, of the January 1999 ruling in which the Mexican court *596denied Sharp’s claim for lack of proof. In its Motion to Dismiss filed in this case in July 2001, the Agral Companies stated that “[t]he Mexican insolvency court has already ruled on Sharp Capital’s application for enforcement of the arbitral award at issue here,” referring to the January 1999 ruling on Sharp’s claim. There is no indication in the record that ITL took any action in response to these facts to protect its claim before the Mexican bankruptcy court, for example by withdrawing Sharp’s authority to act on its behalf or to substitute an alternative representative. However, based on the record before us, we cannot determine that any lack of diligence by ITL had any affect on the failure of the Mexican court to give notice of the motion to Sharp.2 The Mexican court apparently signed the order removing Sharp as provisional intervenor ex parte without giving notice of GEN’s motion to any interested party.
Accordingly, the Agral Companies have failed to meet their burden of proof that ITL was afforded an opportunity to be heard in the Mexican court on the issues underlying the motion to dismiss Sharp as intervenor that the Agral Companies seek to enforce in this court. In these circumstances, we conclude that the district court abused its discretion in accepting that ruling under principles of comity.
IV.
Based on the above outlined facts, the Agral Companies did not meet their burden of proof on the defense of comity, because they did not demonstrate that ITL (or its representative) was afforded notice and an opportunity to be heard on the motion to dismiss the provisional in-tervenor on grounds that ITL’s agent validly assigned the Award. The district court abused its discretion in applying comity to the Mexican Bankruptcy court’s order granting the motion and its implicit holding that ITL had no interest in the Award. The district court did not reach the alternative arguments of the parties and did not rule on whether the assignments were valid or on the Agral Companies’ causation challenge to ITL’s standing. The district court should consider these arguments including any factual issues necessary to resolve them in the first instance. Accordingly, we vacate the district court’s judgment and remand this case to the district court for further proceedings consistent with this opinion.
VACATED and REMANDED.
. ITL argues that Pepsi-Gemex is the alter ego or successor of the Agral Companies. Pepsi-Gemex filed a motion to dismiss for lack of jurisdiction that became moot by the district court’s granting of the Agral Companies motion to dismiss.
. We cannot say that notice to Sharp and its fraudulent principals would not have been transmitted to ITL. At the time the motion was filed, a special master appointed by the S.E.C. was in place to oversee Sharp.