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Invoices vs orders: These guides walk through invoices (formal billing, line items, publish). The collect flow is the same for orders — use /v1/orders/* instead of /v1/invoices/* and set source_type: "ORDER" on the checkout session. See Orders and Parties & counterparties.Hosted checkout: To skip party, invoice, session, and execute steps entirely, see Hosted checkout.
End-to-end invoice collection with PHP 8.1+ and cURL (or Guzzle). See Quick Start for the full multi-language tutorial.
API Reference: Obtain token · Collect

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Prerequisites

  • PHP 8.1+ with curl extension (or guzzlehttp/guzzle)
  • API credentials in environment variables — server-side only

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Steps

1

Get an access token

$baseUrl = 'https://api.heydollr.app';

$ch = curl_init("$baseUrl/v1/jwt/client/obtain/token");
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST           => true,
    CURLOPT_HTTPHEADER     => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS     => json_encode([
        'client_id'     => getenv('DOLLR_CLIENT_ID'),
        'client_secret' => getenv('DOLLR_CLIENT_SECRET'),
    ]),
]);
$token = json_decode(curl_exec($ch), true)['access_token'];
curl_close($ch);

$headers = [
    'Authorization: Bearer ' . $token,
    'Content-Type: application/json',
];
2

Party, counterparty, invoice

function dollrPost(string $url, array $body, array $headers): array {
    $ch = curl_init($url);
    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST           => true,
        CURLOPT_HTTPHEADER     => $headers,
        CURLOPT_POSTFIELDS     => json_encode($body),
    ]);
    $out = json_decode(curl_exec($ch), true);
    curl_close($ch);
    return $out;
}

$party = dollrPost("$baseUrl/v1/parties/create", [
    'fullname' => 'Amara Kamara', 'phone' => '231771234567',
    'email' => 'amara@example.com', 'country_code' => 'LR',
], $headers);

$cp = dollrPost("$baseUrl/v1/counterparties/create", [
    'relationship_type' => 'CUSTOMER', 'party_id' => $party['id'],
], $headers);

$invoice = dollrPost("$baseUrl/v1/invoices/create", [
    'counterparty_id' => $cp['id'], 'currency' => 'USD',
    'note' => 'Consulting', 'fee_bearer' => 'PAYER', 'as_payment_link' => true,
], $headers);
3

Publish, session, execute

$invoiceId = $invoice['id'];
dollrPost("$baseUrl/v1/invoices/$invoiceId/items/add", [
    'name' => 'Strategy Session', 'currency' => 'USD', 'qty' => 1, 'amount' => 250.0,
], $headers);

// PUT publish — use curl_setopt CURLOPT_CUSTOMREQUEST => 'PUT'
$referenceId = bin2hex(random_bytes(16)); // use ramsey/uuid or uuid4() in production

$session = dollrPost("$baseUrl/v1/sessions/checkout", [
    'source_id' => $invoiceId, 'source_type' => 'INVOICE',
], $headers);

$execution = dollrPost("$baseUrl/v1/executions/collection", [
    'session_id'         => (string) $session['id'],
    'payment_account_id' => 'YOUR_PAYMENT_ACCOUNT_ID',
    'currency'           => 'USD',
    'reference_id'       => $referenceId,
], $headers);
Register a payment account before execute. Store $referenceId before the HTTP call.
4

Poll status

$ch = curl_init("$baseUrl/v1/status/collection/$referenceId");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$status = json_decode(curl_exec($ch), true);
curl_close($ch);

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Try it yourself

Hosted checkout

Mobile money and card on a Dollr-hosted page — fastest path.

Orders

Same collect flow with source_type: ORDER and /v1/orders/*.

Direct checkout

One API call to create source — API-embedded flow.
Last modified on May 22, 2026