MoMo API Sand Box Q&amp;A

Getting 200 response when creating Api User.

I believe I an following the instructions correctly. POST https://sandbox.momodeveloper.mtn.com/v1_0/apiuser HTTP/1.1X-Reference-Id: f9b22c29-eaeb-4423-9a29-960ece987648Content-Type: application/jsonCache-Control: no-cacheOcp-Apim-Subscription-Key: ••••••••••••••••••••••••••••••••{ providerCallbackHost: "string"}The X-Reference-Id is a UUID from online generator.Ocp-Apim-Subscription-Key is from mu Collection product.The result:HTTP/1.1 200 OKcache-control: no-cachecontent-length: 247content-type: text/html; charset=utf-8pragma: no-cachevary: Originx-content-type-options: nosniffx-frame-options: SAMEORIGINx-xss-protection: 1; mode=block<html><head><title>Request Rejected</title></head><body>The requested URL was rejected. Please consult with your administrator. Your support ID is: 11597720049319855937 <a href='javascript:history.back();'>[Go Back]</a></body&gt

453

24 days ago

mamta_kumavatNew Member

SandBox and Production Mode doubt

I’m getting invalid subscription key invalid while testing it in sandbox mode while testing it with live url it give resource not found.Below is for sandbox Mode.URL :: https://sandbox.momodeveloper.mtn.com/v1_0/apiuser headers :: {Authorization: Basic ZmY5NTZkMGYtODYwOC00NmZhLWIzMzEtZjRkNDhmNzAwZTNiOm51bGw=, X-Reference-Id: ff956d0f-8608-46fa-b331-f4d48f700e3b, Ocp-Apim-Subscription-Key: 84dbf7a8a0e44923988a0dd621169ec6, Content-Type: application/json} MtnMomo :: body :: {providerCallbackHost: https://dulu.cm/success} [log]MtnMomo :: apiuserAPI :: 401 :: { "statusCode": 401, "message": "Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription." }Below is for live testing URL :: https://proxy.momoapi.mtn.com/v1_0/apiuser headers :: {X-Reference-Id: 6e1fcdda-0cb1-4a85-8af6-8e3e6ff31942, Ocp-Apim-S

270

menziNew Member

Create user request

Please assist, I am getting this error from the andbox

261

devsmsNew Member

Sandbox RequestToPay | 400 Bad Request Error

These are the steps I follow, I have created a collection product and I have my primary and secondary subscription keys.First step was to create an API user when was successful Second step, i created an API key for the API user which was successful. Third step, I created an access token for the user under the collections product subscription. Fourth step, I initiated the requestToPay request but it keeps failing with a 400 Bad Request. Is this an issue currently with the system (going by the error, it is not) or is it specific t

961

ranihaddadNew Member

Unable to Generate API User – Invalid Subscription Key Error

I hope you are doing well. I need assistance with an issue I am encountering while trying to generate an API user in sandbox environment.I have followed all the steps outlined in the documentation: Signup For An Account – Completed Subscribe To Our Products – Completed (subscribed to Collection Widget) Manage Your Subscriptions – Subscription is active, and I have received both the primary and secondary keys Generate API User and API Key – This step is failing To generate the API user, I am using the following endpoint:POST https://sandbox.momodeveloper.mtn.com/v1_0/apiuserHeaders sent:{ "X-Reference-Id": "<uuid-v4>", "Ocp-Apim-Subscription-Key": "<Subscription-Primary-Key>", "Content-Type": "application/json"

561

kpatchaviNew Member

Request to pay dont send callback

Hi everyone,I’m having some trouble with the MTN MoMo API, specifically with the requestToPay endpoint.When I send a requestToPay, I get an HTTP 200 response, but the body looks like this: HTTP/1.1 200 OK cache-control: no-cache content-length: 247 content-type: text/html; charset=utf-8 pragma: no-cache vary: Origin x-content-type-options: nosniff x-frame-options: SAMEORIGIN x-xss-protection: 1; mode=block <html> <head><title>Request Rejected</title></head> <body> The requested URL was rejected. Please consult with your administrator. Your support ID is: 11597720049318046811 <a href='javascript:history.back();'>[Go Back]</a> </body> </html> The problem is that no callback is ever sent, even though I receive this 200 response.Has anyone experienced this before or knows what might b

280

MatteoNew Member

Can I get 2 different users to pay each other on my app with this api?

I have a mobile application in which people can buy products/services from other users.Is it possible for the sellers, when they signup, to link their mobile money account with this API, so that when the buyers go to buy a product from the seller, they can pay - either with just mobile money too or other payment methods ( I am not sure how that works with this API) - directly too the sellers mobile money account.Also how would this work with different currencies / countries?Thank you MoMo community!

300

wkangongNew Member

bad request remittance transfer

I am getting remittance transfer bad request error message. my request body is this. any wrong?{ "amount": "600", "currency": "EUR", "externalId": "00004335", "payee": { "partyIdType": "MSISDN", "partyId": "56733123450" }, "payerMessage": "MoMo Market Payment", "payeeNote": "MoMo Market Payment"}

110

edwin.niwahaNew Member

sandbox error

https://momodeveloper.mtn.com/sandbox/Hello MoMo community,I get the below error message on trying to access the sandboxOops, something went wrong

190

nanayawActive

Access token not included in the response(Response 200)

The documentation is very conclusive but the last step in the process was not yielding me what I wanted and I found a video on youtube which used the reference id (uuid) as a username and the api key as the password. As shown in this image https://postimg.cc/87S93Mrk . There was no token. Please I need to clarify the contents of the last request. I don’t want to say the documentation is wrong but the difference is the video used basic auth in the authorization and followed it as I described earlierResponse ```{ "providerCallbackHost": "string", "targetEnviron

231

wkangongNew Member

StatusCode: 500, ReasonPhrase: 'Server Error'

{StatusCode: 500, ReasonPhrase: 'Server Error', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:{ X-XSS-Protection: 1; mode=block Request-Context: appId=cid-v1:e996501c-e721-4ac1-97ff-dc6887b85e8c Date: Wed, 24 Sep 2025 18:39:51 GMT Content-Length: 0}} what is the fixed

283

3 months ago

bhavinNew Member

Unable to obtain a new access token.

i have got error in laravel “Unable to obtain a new access token.”in sendbox

130

4 months ago

oforismlNew Member

Open API Post request Failure: Sandbox Environment

I am consuming the MTN Open API and most of the endpoints worked except for some specific endpoints which I would enlist below;Kindly note that the response I receive from these are all BAD REQUEST so kindly help me out in determining what is the issue; Request to Pay: POST https://sandbox.momodeveloper.mtn.com/collection/v1_0/requesttopayHeaders: X-Target-Environment X-Callback-Url X-Reference-Id Ocp-Apim-Subscription-Key Authorization Request Body: {"amount": "2.0","currency": "GH","externalId": "7916d515-ab40-4bba-bb67-b68bfb13b94c","payer": {"partyIdType": "MSISDN","partyId": "23354****414"},"payerMessage":

14411

4 months ago

DrRamazzottiActive

Sandbox Callback

Hi @all,I configured a user and api key. The call works (requesttopay), but the callback is not executed.I added the host dev.domain.com.xyHeader param for callback is “http://dev.domain.com.xy/webhook/mtnmomo”.No callback.Creating another user with callback domain “domain.com” it works…Any issues with “uncommon” domainnames?

510

4 months ago

DnlcodessNew Member

HELP!!! I’m unable to create an API USER

I tried creating an api user in the postman by sending a post request on postman to this link https://sandbox.momodeveloper.mtn.com/v1_0/apiuser. The post request contained in my header X-Referene-Id(a random uuid generated by a uuid generator), Ocp—Apim-Subscription-Key(which is the primary key gotten after subsrcibing to a product, in my case I subsricbed to the collection widget producr) and Content-type(whose value was application/json). After doing all of this and sending the post request, I am getting a status code of 401 “saying Access Denied due to invalid subscription key. Make sure to provide a valid key for an active subscription”. I have confirmed multiple times that I use the primary key and i even tried out the secondary key but same thing, I have tried to open another account to subscribe to a new product, yet still the same thing. I will sincerely a

1224

5 months ago

mutangizi ronaldNew Member

am failing to create the access token

i dont know when i try to create the access token in the sandbox i get 401 response invalid client .any one help me

1483

6 months ago

wkangongNew Member

Phone Support

we are working on a time sensitive important project and encountering login failure while trying to obtain an access token using basic authentication

521

6 months ago

kmdfmsNew Member

apiuser

I successfully created it using/v1/0/apiuser/v1/0我使用/v1/0/apiuser/v1/0成功创建了它I successfully created it using/v1/0/apiuser/v1/0 apiuser, but using/V1_0/apiuser/{X-Reference Id} does not return any data for apiUser. Which API do I need to use to obtain apiUser? I can successfully obtain apiKey through/v1.0/apiuser/{X-Reference Id}/apikey

361

8 months ago

TeccoNew Member

what is the collection widget about

I have been looking through the documentation and can’t find much information about the collection widget product. All I could find is that it enables a developer or partner to integrate a MoMoPay checkout button to accept Mobile Money payments on your e-commerce site. but what differentiates it from the othe collections product and how can we implement it in the sand box.

1504

8 months ago

csmitNew Member

Sandbox access token invalid token_type?

Hi!When I do a POST to the CreateAccessToken endpoint I get a response where the token_type has a value set to "access_token" instead of something like "Bearer". I’m expecting the token_type to be Bearer since the Transfer endpoint documentation states that the Authorization header should be the “Bearer Authentication Token generated using CreateAccessToken API Call”.Am I missing something?Any help/advice would be greatly appreciated!

380

9 months ago

BoanergesNew Member