MoMo API Sand Box Q&A

Where can I find the JavaScript implementation code for the Collection Widget? I need the widget.js URL and initialization code.

I have a WordPress site and I want to add an MTN collection widget to allow people to donate to our website using it?

HiI wanted to integrate payment gateway in my web application based on flutter web and node js, Can you pleas guide me step by step process for doing this. Also let me know about the required API keys and from where i can get these.Thanks

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.<br><br>Your support ID is: 11597720049319855937<br><br><a href='javascript:history.back();'>[Go Back]</a></body></html>

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 to me?  

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"}Body :{  "providerCallbackHost": "webhook.site"} However, the API returns the following error:Response:{  "statusCode": 401,  "message": "Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription."} I have veri

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!

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"}

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

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",    "targetEnvironment": "sandbox"}```

{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

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

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": "Kindly accept for payment of TEST","payeeNote": "Thanks for paying for Test"}   Disbursement / Transfer       POST: https://sandbox.momodeveloper.mtn.com/disbursement/v1_0/transfer       Headers:   X-Target-Environment   X-Callback-Url          X-Reference-Id   Ocp-Apim-Subscription-Key   Authorization Request Body: {"amount": "2.0","currency": "GH","externalId": "e4f7

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 appreciate it if this can be attended to as soon as possible 

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

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

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  

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.

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!

I am trying to creacte an api user in the sandbox environment, I can verify that I am doing everything correctly however I am getting “Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription.” . I have tried using the primary and secondary keys, none are working for me. I have gone through most of the issues mentioned and the solution people justed nothing seems to be working for me. As a reference this is the request I am making,curl --location 'https://sandbox.momodeveloper.mtn.com/v1_0/apiuser' \--header 'Ocp-Apim-Subscription-Key: b93400415bde4c96b06c57e698789cda' \--header 'X-Reference-Id: 8b1a5696-9c43-41c6-a884-d11e0f5bfe17' \--header 'Content-Type: application/json' \--data '{    "providerCallbackHost": "https://webhook.site/b6b6cb4c-e9fa-42b8-96a8-b82e25859b85"}' 

Hello, i m using momo for wallet base . The wallet is not momo wallet but the user can request to send money in her momo to another account. We need to check balance and transfert the Money from one account to another . How can i achieved that  ?  thanks 

Hi there,It seems that you have some issues with the generated subscription keys for this Collection Widget. Can you please help me get a proper key that I can use. Neither the primary nor the secondary keys are working.

Hello,I am trying to call disbursement/v1_0/refund on the sandbox but I always get http 400 - Bad Request.Is this method working on the sandbox ? I’ve also tried from your documentation website. Here is the syntax used : POST https://sandbox.momodeveloper.mtn.com/disbursement/v1_0/refund HTTP/1.1Authorization: ...X-Reference-Id: 0a63a755-355f-409c-a94d-a42818dea651X-Target-Environment: sandboxContent-Type: application/jsonCache-Control: no-cacheOcp-Apim-Subscription-Key: 539f8a1f05d94b17a4e53cbe90219f15{    "amount": "7500.9",    "currency": "EUR",    "externalId": "2B58A65F38C5EA0EE06323671FAC0695",    "referenceIdToRefund": "579530f0-68d5-4886-b352-bdec7f816c9f"} HTTP/1.1 400 Bad Requestcontent-length: 0date: Fri, 10 Jan 2025 13:38:44 GMTvary: Originx-xss-protection: 1; mode=block

Hello sir/madam,I have subscripted Collection Widget product but both key is not working. please help.

I have created an API user and API key on sandbox and has set the providerCallbackHost correctly, However when I try to make a disbursement on the endpoint disbursement/v1_0/deposit, I am getting the error “Callback URL does not match the configured value.” on request. even though the callback url host is the same as providerCallbackHost when creating the API user.attached are screenshots of the request and response.